iOS开发常用代码大全

作者: Arackboss | 来源:发表于2017-09-04 14:24 被阅读0次

判断邮箱格式是否正确的代码

-(BOOL)isValidateEmail:(NSString *)email

{

NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex];

return [emailTest evaluateWithObject:email];

}

判断是否有特殊字符

+(BOOL)isContainsSpecialCharacters:(NSString *)string{
    NSString *regex = @".*[-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]+.*";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    
    if ([predicate evaluateWithObject:string]==YES) {
        
        return YES;
        
    }else{
        return NO;
    }
    
}

判断是否包含汉字

+(BOOL)isChinese:(NSString *)str {
    for(int i=0; i< [str length];i++){
        int a = [str characterAtIndex:i]; if( a > 0x4e00 && a < 0x9fff){
            return YES;
        }
        
    }
    return NO;
}

身份证号码验证

#pragma mark -身份证号全校验
+ (BOOL)verifyIDCardNumber:(NSString *)IDCardNumber
{
   IDCardNumber = [IDCardNumber stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
   if ([IDCardNumber length] != 18)
   {
       return NO;
   }
   NSString *mmdd = @"(((0[13578]|1[02])(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)(0[1-9]|[12][0-9]|30))|(02(0[1-9]|[1][0-9]|2[0-8])))";
   NSString *leapMmdd = @"0229";
   NSString *year = @"(19|20)[0-9]{2}";
   NSString *leapYear = @"(19|20)(0[48]|[2468][048]|[13579][26])";
   NSString *yearMmdd = [NSString stringWithFormat:@"%@%@", year, mmdd];
   NSString *leapyearMmdd = [NSString stringWithFormat:@"%@%@", leapYear, leapMmdd];
   NSString *yyyyMmdd = [NSString stringWithFormat:@"((%@)|(%@)|(%@))", yearMmdd, leapyearMmdd, @"20000229"];
   NSString *area = @"(1[1-5]|2[1-3]|3[1-7]|4[1-6]|5[0-4]|6[1-5]|82|[7-9]1)[0-9]{4}";
   NSString *regex = [NSString stringWithFormat:@"%@%@%@", area, yyyyMmdd  , @"[0-9]{3}[0-9Xx]"];
   
   NSPredicate *regexTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
   if (![regexTest evaluateWithObject:IDCardNumber])
   {
       return NO;
   }
   int summary = ([IDCardNumber substringWithRange:NSMakeRange(0,1)].intValue + [IDCardNumber substringWithRange:NSMakeRange(10,1)].intValue) *7
   + ([IDCardNumber substringWithRange:NSMakeRange(1,1)].intValue + [IDCardNumber substringWithRange:NSMakeRange(11,1)].intValue) *9
   + ([IDCardNumber substringWithRange:NSMakeRange(2,1)].intValue + [IDCardNumber substringWithRange:NSMakeRange(12,1)].intValue) *10
   + ([IDCardNumber substringWithRange:NSMakeRange(3,1)].intValue + [IDCardNumber substringWithRange:NSMakeRange(13,1)].intValue) *5
   + ([IDCardNumber substringWithRange:NSMakeRange(4,1)].intValue + [IDCardNumber substringWithRange:NSMakeRange(14,1)].intValue) *8
   + ([IDCardNumber substringWithRange:NSMakeRange(5,1)].intValue + [IDCardNumber substringWithRange:NSMakeRange(15,1)].intValue) *4
   + ([IDCardNumber substringWithRange:NSMakeRange(6,1)].intValue + [IDCardNumber substringWithRange:NSMakeRange(16,1)].intValue) *2
   + [IDCardNumber substringWithRange:NSMakeRange(7,1)].intValue *1 + [IDCardNumber substringWithRange:NSMakeRange(8,1)].intValue *6
   + [IDCardNumber substringWithRange:NSMakeRange(9,1)].intValue *3;
   NSInteger remainder = summary % 11;
   NSString *checkBit = @"";
   NSString *checkString = @"10X98765432";
   checkBit = [checkString substringWithRange:NSMakeRange(remainder,1)];// 判断校验位
   return [checkBit isEqualToString:[[IDCardNumber substringWithRange:NSMakeRange(17,1)] uppercaseString]];
}

判断字符串是否为空
+(NSString *)stringIsEmpty:(NSString *)str{

NSString *string=[NSString stringWithFormat:@"%@",str];

if ([string isEqualToString:@""]||[string isEqualToString:@"(null)"]||[string isEqualToString:@"<null>"]||string==nil||[string isEqual:[NSNull class]]) {
```
  string=@"";
```
}
return string;
}
压缩图片

/**
 *  实现图片的缩小或者放大
 *
 *  @param size  大小范围
 *
 *  @return 新的图片
 */
-(UIImage*)scaleImageWithSize:(CGSize)size
{
    UIGraphicsBeginImageContextWithOptions(size,NO,0);  //size 为CGSize类型，即你所需要的图片尺寸
    [self drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage * scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return scaledImage;   //返回的就是已经改变的图片
}

让网络加载图片有个动画效果(前提是导入了SDWebImage)

-(void)animationWithImage:(NSString *)imageName
{
    [self sd_setImageWithURL:[NSURL URLWithString:imageName] placeholderImage:nil completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        if (image && cacheType == SDImageCacheTypeNone)
        {
            self.alpha = 0;
            [UIView animateWithDuration:0.5 animations:^{
                
                self.alpha = 1.0f;
            }];
            
        }
        else
        {
            self.alpha = 1.0f;
        }
    }];
}

根据字符串的长度计算高度

+ (CGSize)sizeWithString:(NSString *)string font:(CGFloat)font maxWidth:(CGFloat)maxWidth

{
    
    NSDictionary *attributesDict = @{NSFontAttributeName:FONT(font)};
    
    CGSize maxSize = CGSizeMake(maxWidth, MAXFLOAT);
    
    CGRect subviewRect = [string boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attributesDict context:nil];
    
    return subviewRect.size;
    
}

拼接属性字符串，在电商类应用用的比较多（比如价格,市场价和销售价，此时可以用一个lable搞定，而不用两个label）

+(NSAttributedString *)recombinePrice:(CGFloat)CNPrice orderPrice:(CGFloat)unitPrice
{
    NSMutableAttributedString *mutableAttributeStr = [[NSMutableAttributedString alloc] init];
    NSAttributedString *string1 = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"￥%.f",unitPrice] attributes:@{NSForegroundColorAttributeName : [UIColor redColor],NSFontAttributeName : [UIFont boldSystemFontOfSize:12]}];
    NSAttributedString *string2 = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"￥%.f",CNPrice] attributes:@{NSForegroundColorAttributeName : [UIColor lightGrayColor],NSFontAttributeName : [UIFont boldSystemFontOfSize:11],NSStrikethroughStyleAttributeName :@(NSUnderlineStyleSingle),NSStrikethroughColorAttributeName : [UIColor lightGrayColor]}];
    [mutableAttributeStr appendAttributedString:string1];
    [mutableAttributeStr appendAttributedString:string2];
    return mutableAttributeStr;
}

调整label行间距

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineSpacing = lineSpace; // 调整行间距
    NSRange range = NSMakeRange(0, [string length]);
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:range];
    return attributedString;
}

创建导航栏按钮

+ (UIBarButtonItem *)itemWithImageName:(NSString *)imageName highImageName:(NSString *)highImageName target:(id)target action:(SEL)action
{
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 40, 30)];
    [button setBackgroundImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
    [button setBackgroundImage:[UIImage imageNamed:highImageName] forState:UIControlStateHighlighted];
    button.size = button.currentBackgroundImage.size;//按钮的尺寸为按钮的背景图片的尺寸
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    return [[UIBarButtonItem alloc] initWithCustomView:button];
}

数组的安全操作

- (id)h_safeObjectAtIndex:(NSUInteger)index{
    if(self.count == 0) {
        NSLog(@"--- mutableArray have no objects ---");
        return (nil);
    }
    if(index > MAX(self.count - 1, 0)) {
        NSLog(@"--- index:%li out of mutableArray range ---", (long)index);
        return (nil);
    }
    return ([self objectAtIndex:index]);
}

获取当前时间

-(NSDate *)getCurrentDate
{
    NSDate *senddate = [NSDate date];
    NSDateFormatter *dateformatter = [[NSDateFormatter alloc] init];
    [dateformatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
    NSString *date1 = [dateformatter stringFromDate:senddate];
    return [self stringToDate:date1 withDateFormat:@"YYYY-MM-dd HH:mm:ss"];
 
}

比较两个时间的大小

-(int)compareDate:(NSDate*)date01 withDate:(NSDate*)date02{
    int ci;
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    [df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSComparisonResult result = [date01 compare:date02];
    switch (result)
    {
            //date02比date01大
        case NSOrderedAscending: ci=1; break;
            //date02比date01小
        case NSOrderedDescending: ci=-1; break;
            //date02=date01
        case NSOrderedSame: ci=0; break;
        default: NSLog(@"erorr dates %@, %@", date01, date02); break;
    }
    return ci;
}

日期格式转字符串

//日期格式转字符串
- (NSString *)dateToString:(NSDate *)date withDateFormat:(NSString *)format
{
       NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
   [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
   [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:8 * 3600]];
   NSString *strDate = [dateFormatter stringFromDate:date];
   
   return strDate;
}

字符串转日期格式

- (NSDate *)stringToDate:(NSString *)dateString withDateFormat:(NSString *)format
{
   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:8 * 3600]];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *retdate = [dateFormatter dateFromString:dateString];
    return retdate;
}

将世界时间转化为中国区时间

- (NSDate *)worldTimeToChinaTime:(NSDate *)date
{
    NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
    NSInteger interval = [timeZone secondsFromGMTForDate:date];
    NSDate *localeDate = [date  dateByAddingTimeInterval:interval];
    return localeDate;
}

传入今天的时间，返回明天的时间

//传入今天的时间，返回明天的时间
- (NSString *)GetTomorrowDay:(NSDate *)aDate {
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *components = [gregorian components:NSCalendarUnitWeekday | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:aDate];
    [components setDay:([components day]+1)];
    
    NSDate *beginningOfWeek = [gregorian dateFromComponents:components];
    NSDateFormatter *dateday = [[NSDateFormatter alloc] init];
    [dateday setDateFormat:@"yyyy-MM-dd"];
    return [dateday stringFromDate:beginningOfWeek];
}

字符串MD5加密

/** MD5加密得到sign字符串*/
+(NSString *) md5String:(NSString *) input {
        const char *cStr = [input UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5( cStr, (CC_LONG)strlen(cStr), digest ); // This is the md5 call
    
    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    
    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
        [output appendFormat:@"%02x", digest[i]];
    return  output;
}

字符串base64加密

+ (NSString *)base64StringFromText:(NSString *)text
{
    if (text && ![text isEqualToString:LocalStr_None]) {
        //取项目的bundleIdentifier作为KEY  改动了此处
        //NSString *key = [[NSBundle mainBundle] bundleIdentifier];
        NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];
        //IOS 自带DES加密 Begin  改动了此处
        //data = [self DESEncrypt:data WithKey:key];
        //IOS 自带DES加密 End
        return [self base64EncodedStringFrom:data];
    }
    else {
        return LocalStr_None;
    }
}

base64解密字符串

/** 解密 */
+ (NSString *)textFromBase64String:(NSString *)base64
{
    if (base64 && ![base64 isEqualToString:LocalStr_None]) {
        //取项目的bundleIdentifier作为KEY   改动了此处
        //NSString *key = [[NSBundle mainBundle] bundleIdentifier];
        NSData *data = [self dataWithBase64EncodedString:base64];
        //IOS 自带DES解密 Begin    改动了此处
        //data = [self DESDecrypt:data WithKey:key];
        //IOS 自带DES加密 End
        return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    }
    else {
        return LocalStr_None;
    }
}

字符串反转

**字符串反转**
//第一种：
- (NSString *)reverseWordsInString:(NSString *)str
{ 
     NSMutableString *newString = [[NSMutableString alloc] initWithCapacity:str.length];
     for(NSInteger i = str.length - 1; i >= 0 ; i --)
      {
           unichar ch = [str characterAtIndex:i];   
          [newString appendFormat:@"%c", ch]; 
      } 
      return newString;
}

tableView刷新指定行

[tabelView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForRow:IndexPath.row inSection:IndexPath.section], nil] withRowAnimation:UITableViewRowAnimationNone];

tableView刷新指定组

NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:2];    
[tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];

将十六进制颜色转换为 UIColor 对象

+ (UIColor *)colorWithHexString:(NSString *)color{
    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    // String should be 6 or 8 characters
    if ([cString length] < 6) {
        return [UIColor clearColor];
    }
    // strip "0X" or "#" if it appears
    if ([cString hasPrefix:@"0X"])
        cString = [cString substringFromIndex:2];
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return [UIColor clearColor];
    // Separate into r, g, b substrings
    NSRange range;
    range.location = 0;
    range.length = 2;
    //r
    NSString *rString = [cString substringWithRange:range];
    //g
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    //b
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    // Scan values
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];
}

全屏截图

+ (UIImage *)shotScreen{
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    UIGraphicsBeginImageContext(window.bounds.size);
    [window.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

截取view中某个区域生成一张图片

+ (UIImage *)shotWithView:(UIView *)view scope:(CGRect)scope{
    CGImageRef imageRef = CGImageCreateWithImageInRect([self shotWithView:view].CGImage, scope);
    UIGraphicsBeginImageContext(scope.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGRect rect = CGRectMake(0, 0, scope.size.width, scope.size.height);
    CGContextTranslateCTM(context, 0, rect.size.height);//下移
    CGContextScaleCTM(context, 1.0f, -1.0f);//上翻
    CGContextDrawImage(context, rect, imageRef);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    CGImageRelease(imageRef);
    CGContextRelease(context);
    return image;
}

给Image加圆角

给UIImage添加生成圆角图片的扩展API：  
- (UIImage *)imageWithCornerRadius:(CGFloat)radius {  
  CGRect rect = (CGRect){0.f, 0.f, self.size};  
  UIGraphicsBeginImageContextWithOptions(self.size, NO, UIScreen.mainScreen.scale);  
  CGContextAddPath(UIGraphicsGetCurrentContext(),  
                   [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius].CGPath);  
  CGContextClip(UIGraphicsGetCurrentContext());  
  [self drawInRect:rect];  
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();  
  
  UIGraphicsEndImageContext();  
  
  return image;  
}  
//然后调用时就直接传一个圆角来处理：  
  
imgView.image = [[UIImage imageNamed:@"test"] hyb_imageWithCornerRadius:4];  
//最直接的方法就是使用如下属性设置：  
imgView.layer.cornerRadius = 10;  
// 这一行代码是很消耗性能的  
imgView.clipsToBounds = YES;  
//好处是使用简单，操作方便。坏处是离屏渲染（off-screen-rendering）需要消耗性能。对于图片比较多的视图上，不建议使用这种方法来设置圆角。通常来说，计算机系统中CPU、GPU、显示器是协同工作的。CPU计算好显示内容提交到GPU，GPU渲染完成后将渲染结果放入帧缓冲区。  
//简单来说，离屏渲染，导致本该GPU干的活，结果交给了CPU来干，而CPU又不擅长GPU干的活，于是拖慢了UI层的FPS（数据帧率），并且离屏需要创建新的缓冲区和上下文切换，因此消耗较大的性能。

删除缓存

- (void)removeCache  
{  
    NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];  
    NSLog(@"%@",cachePath);  
    NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachePath];  
    for (NSString *p in files) {  
        NSString *path = [NSString stringWithFormat:@"%@/%@", cachePath, p];  
        if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {  
            [[NSFileManager defaultManager] removeItemAtPath:path error:nil];  
        }  
    }  
}

计算清除的缓存大小

- (CGFloat)floatWithPath:(NSString *)path  
{  
    CGFloat num = 0;  
    NSFileManager *man = [NSFileManager defaultManager];  
    if ([man fileExistsAtPath:path]) {  
        NSEnumerator *childFile = [[man subpathsAtPath:path] objectEnumerator];  
        NSString *fileName;  
        while ((fileName = [childFile nextObject]) != nil) {  
            NSString *fileSub = [path stringByAppendingPathComponent:fileName];  
            num += [self fileSizeAtPath:fileSub];  
        }  
    }  
    return num / (1024.0 * 1024.0);  
}

计算单个文件大小

- (long long)fileSizeAtPath:(NSString *)file  
{  
    NSFileManager *man = [NSFileManager defaultManager];  
    if ([man fileExistsAtPath:file]) {  
        return [[man attributesOfItemAtPath:file error:nil] fileSize];  
    }  
    return 0;  
}

通过视图，寻找父控制器

- (UIViewController *)viewController
{
    for (UIView* next = [self superview]; next; next = next.superview) {
        UIResponder *nextResponder = [next nextResponder];
        if ([nextResponder isKindOfClass:[UIViewController class]]) {
            return (UIViewController *)nextResponder;
        }
    }
    return nil;
}

给textField加上右边的视图

  UIButton *eyeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
  [eyeBtn setImage:[UIImage imageNamed:@"icon_close_eye"] forState:UIControlStateNormal];
  [eyeBtn setImage:[UIImage imageNamed:@"icon_open_eye"] forState:UIControlStateSelected];
        eyeBtn.width = 30;
        eyeBtn.height = 30;
        _passwordField.rightView = eyeBtn;
        [eyeBtn addTarget:self action:@selector(showPwd:) forControlEvents:UIControlEventTouchUpInside];
        _passwordField.rightViewMode = UITextFieldViewModeAlways;

UITableViewCell选中后其子视图颜色会改变，重写下面两个方法可以避免UI出入

- (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated {
    [super setHighlighted:highlighted animated:animated];
    
    self.lineview.backgroundColor = MColor;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    
    self.lineview.backgroundColor = MColor;
}

传入一段H5代码获取其中所有的img元素的Url

- (NSArray *) getImageurlFromHtml:(NSString *) webString
{
    NSMutableArray * imageurlArray = [NSMutableArray arrayWithCapacity:1];
    
    //标签匹配
    NSString *parten = @"<img(.*?)>";
    NSError* error = NULL;
    NSRegularExpression *reg = [NSRegularExpression regularExpressionWithPattern:parten options:0 error:&error];
    
    NSArray* match = [reg matchesInString:webString options:0 range:NSMakeRange(0, [webString length] - 1)];
    
    for (NSTextCheckingResult * result in match) {
        
        //过去数组中的标签
        NSRange range = [result range];
        NSString * subString = [webString substringWithRange:range];
        
        
        //从图片中的标签中提取ImageURL
        NSRegularExpression *subReg = [NSRegularExpression regularExpressionWithPattern:@"http://(.*?)\"" options:0 error:NULL];
        NSArray* match = [subReg matchesInString:subString options:0 range:NSMakeRange(0, [subString length] - 1)];
        NSTextCheckingResult * subRes = match[0];
        NSRange subRange = [subRes range];
        subRange.length = subRange.length -1;
        NSString * imagekUrl = [subString substringWithRange:subRange];
        
        //将提取出的图片URL添加到图片数组中
        [imageurlArray addObject:imagekUrl];
    }
    return imageurlArray;
}

给label加下划线，中划线

    NSString *textStr = [NSString stringWithFormat:@"¥%@", oldPrice];
    NSDictionary *attribtDic = @{NSStrikethroughStyleAttributeName:  [NSNumber numberWithInteger:NSUnderlineStyleSingle]};
    NSMutableAttributedString *attribtStr = [[NSMutableAttributedString alloc]initWithString:textStr attributes:attribtDic];
    self.oldPrice_label.attributedText = attribtStr;

利用Quartz2D画一张图片保存到指定位置

   UIGraphicsBeginImageContextWithOptions(CGSizeMake(100, 100), NO, 0);
   CGContextRef ctx = UIGraphicsGetCurrentContext();
   CGContextAddEllipseInRect(ctx, CGRectMake(0, 0, 100, 100));
   CGContextStrokePath(ctx);
   UIImage *image=UIGraphicsGetImageFromCurrentImageContext();
   NSData *data=UIImagePNGRepresentation(image);
   [data writeToFile:@"/Users/yy-info/Documents/Practice/imgName.png" atomically:YES];

给UI控件加上虚线框（Quartz2D绘图)

    
    CGFloat width = _label.frame.size.width;
    
    CGFloat height = _label.frame.size.height;
    
    CAShapeLayer*shapelayer = [CAShapeLayer layer];
    
    shapelayer.bounds=CGRectMake(0,0, width, height);
    
    shapelayer.position=CGPointMake(CGRectGetMinX(_label.bounds),CGRectGetMinY(_label.bounds));
   
    shapelayer.anchorPoint = CGPointMake(0, 0);
    
    shapelayer.path= [UIBezierPath bezierPathWithRoundedRect:shapelayer.bounds cornerRadius:5].CGPath;
    
    shapelayer.lineWidth = 1;
    
    shapelayer.lineDashPattern=@[@5,@2];
    
    shapelayer.fillColor=nil;
    
    shapelayer.strokeColor= [UIColor colorWithRed:51/255.0 green:51/255.0 blue:51/255.0 alpha:1].CGColor;
    
    [_label.layer addSublayer:shapelayer];

*CALayer的震动

  CAKeyframeAnimation*kfa = [CAKeyframeAnimation animationWithKeyPath:@"transform.translation.x"];
    CGFloat s =16;
    kfa.values=@[@(-s),@(0),@(s),@(0),@(-s),@(0),@(s),@(0)];
    //时长
    kfa.duration=.1f;
    //重复
    kfa.repeatCount=9;
    //移除
    kfa.removedOnCompletion=YES;
    [_label.layer addAnimation:kfa forKey:@"shake"];

iOS开发常用代码大全

相关文章

网友评论

延伸阅读

深度阅读

栏目导航

热点阅读