iOS开发小知识点整理第二期（持续更新）

作者: coder小鹏 | 来源:发表于2017-09-26 22:29 被阅读58次

1.根据时间戳显示不同的时间，如果是今年的时间，则显示月日时分秒，如果是今天的时间，显示时分秒，如果不是今年的时间，则显示年月日时分秒

NSTimeInterval  time = [timerInterval doubleValue]/1000;
NSDate *currentDate=[NSDate dateWithTimeIntervalSince1970:time];
//判断是否是今年
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy";
    
NSString *nowYear = [fmt stringFromDate:[NSDate date]];
NSString *selfYear = [fmt stringFromDate:currentDate];
    
if ([nowYear isEqualToString:selfYear]) {
    
    //是今年
    //判断是否是今天
    NSDateFormatter *fmt1 = [[NSDateFormatter alloc] init];
    fmt1.dateFormat = @"yyyyMMdd";
    NSString *nowString = [fmt1 stringFromDate:[NSDate date]];
    NSString *selfString = [fmt1 stringFromDate:currentDate];
    
    if ([nowString isEqualToString:selfString]) {
        
        //是今天 显示时分秒
        NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
        [dateformatter setDateFormat:@"HH:mm:ss"];
        return [dateformatter stringFromDate:currentDate];
        
    }else{
        
        //不是今天 显示月日 时分秒
        NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
        [dateformatter setDateFormat:@"MM-dd HH:mm:ss"];
        return [dateformatter stringFromDate:currentDate];
    }
    
}else{
    
    //不是今年，返回时间的格式为年月日形式
    NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
    [dateformatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    return [dateformatter stringFromDate:currentDate];
}

2.将16进制的字符串转换为UIColor的方法

+ (UIColor *)colorWithHexString:(NSString *)hexColorString {
    if ([hexColorString length] < 6) { //长度不合法
        return [UIColor blackColor];
    }
    NSString *tempString = [hexColorString lowercaseString];
    if ([tempString hasPrefix:@"0x"]) { //检查开头是0x
        tempString = [tempString substringFromIndex:2];
    } else if ([tempString hasPrefix:@"#"]) { //检查开头是#
        tempString = [tempString substringFromIndex:1];
    }
    if ([tempString length] != 6) {
        return [UIColor blackColor];
    }
    //分解三种颜色的值
    NSRange range = NSMakeRange(0, 2);
    NSString *rString = [tempString substringWithRange:range];
    range.location = 2;
    NSString *gString = [tempString substringWithRange:range];
    range.location = 4;
    NSString *bString = [tempString substringWithRange:range];
    //取三种颜色值
    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];
}

3.获取网络视频的时间，将其转换为时分格式

- (NSString *)getVideoInfoWithSourcePath:(NSString *)path{
    AVURLAsset * asset = [AVURLAsset assetWithURL:[NSURL URLWithString:path]];
    CMTime  time = [asset duration];
    int seconds = ceil(time.value/time.timescale);
    
    int second = seconds % 60;
    int minutes = (seconds / 60) % 60;
    return [NSString stringWithFormat:@"%02d:%02d", minutes, second];
}

4.裁剪网络图片，使其显示在控件上不变形

+(UIImage *)getImageFromUrl:(NSURL *)imgUrl imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height{
    
    UIImage * newImage = [self getImageFromUrl:imgUrl imgViewWidth:width imgViewHeight:height];
    
    return newImage;
    
}
//裁剪图片
- (UIImage *)cutImage:(UIImage*)image imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height
{
    //压缩图片
    
    CGSize newSize;
    
    CGImageRef imageRef = nil;
    
    if ((image.size.width / image.size.height) < (width / height)) {
        
        newSize.width = image.size.width;
        
        newSize.height = image.size.width * height /width;
        
        imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, fabs(image.size.height - newSize.height) / 2, newSize.width, newSize.height));
        
    } else {
        
        newSize.height = image.size.height;
        
        newSize.width = image.size.height * width / height;
        
        imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(fabs(image.size.width - newSize.width) / 2, 0, newSize.width, newSize.height));
        
    }
    return [UIImage imageWithCGImage:imageRef];
}

5.图片裁剪

-(UIImage *) scaleImage: (UIImage *)image scaleFactor:(float)scaleBy
{
    if (image.size.width>1000) {
        scaleBy = 1000/image.size.width;
    }else{
        scaleBy= 1.0;
    }
    CGSize size = CGSizeMake(image.size.width * scaleBy, image.size.height * scaleBy);
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGAffineTransform transform = CGAffineTransformIdentity;
    transform = CGAffineTransformScale(transform, scaleBy, scaleBy);
    CGContextConcatCTM(context, transform);
    [image drawAtPoint:CGPointMake(0.0f, 0.0f)];
    UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newimg;
    
}

6.将时间字符串转换为时间戳（format必需和时间字符串时间的格式保持一致）

-(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{
    
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:format];
    NSDate *date = [dateFormatter dateFromString:formatTime];
    //时间转时间戳的方法:
    
    NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];
    
    NSLog(@"将某个时间转化成 时间戳&&&&&&&timeSp:%ld",(long)timeSp); //时间戳的值
    return timeSp;
    
}

7.判断手机号的合法性

+ (BOOL)isMobileNumber:(NSString *)mobileNum
{
    if (mobileNum.length != 11)
    {
        return NO;
    }
    /**
     * 手机号码:
     * 13[0-9], 14[5,7], 15[0, 1, 2, 3, 5, 6, 7, 8, 9], 17[0, 1, 6, 7, 8], 18[0-9]
     * 移动号段: 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
     * 联通号段: 130,131,132,145,155,156,170,171,175,176,185,186
     * 电信号段: 133,149,153,170,173,177,180,181,189
     */
    NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|7[0135678]|8[0-9])\\d{8}$";
    /**
     * 中国移动：China Mobile
     * 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
     */
    NSString *CM = @"^1(3[4-9]|4[7]|5[0-27-9]|7[08]|8[2-478])\\d{8}$";
    /**
     * 中国联通：China Unicom
     * 130,131,132,145,155,156,170,171,175,176,185,186
     */
    NSString *CU = @"^1(3[0-2]|4[5]|5[56]|7[0156]|8[56])\\d{8}$";
    /**
     * 中国电信：China Telecom
     * 133,149,153,170,173,177,180,181,189
     */
    NSString *CT = @"^1(3[3]|4[9]|53|7[037]|8[019])\\d{8}$";
    
    
    NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
    NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
    NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
    
    if (([regextestmobile evaluateWithObject:mobileNum] == YES)
        || ([regextestcm evaluateWithObject:mobileNum] == YES)
        || ([regextestct evaluateWithObject:mobileNum] == YES)
        || ([regextestcu evaluateWithObject:mobileNum] == YES))
    {
        return YES;
    }
    else
    {
        return NO;
    }
}

8.将字符串进行MD5加密

+ (NSString *)md5EncryptWithString:(NSString *)string {
    
     return [self md5:[NSString stringWithFormat:@"%@", string]];
}

+ (NSString *)md5:(NSString *)string{
    const char *cStr = [string UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    
    CC_MD5(cStr, (CC_LONG)strlen(cStr), digest);
    
    NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
        [result appendFormat:@"%02X", digest[i]];
    }
    
    NSLog(@"----%@",result);
    return result;
    
}

9.手机类型的判断

+ (NSString *)iphoneType {
    
    struct utsname systemInfo;
    
    uname(&systemInfo);
    
    NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
    
    if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
    
    if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
    
    if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
    
    if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
    
    if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";
    
    if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";
    
    if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
    
    if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
    
    if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";
    
    if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";
    
    if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";
    
    if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";
    
    if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";
    
    if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";
    
    if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";
    
    if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";
    
    if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";
    
    if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";
    
    if ([platform isEqualToString:@"iPhone9,1"]) return @"iPhone 7";
    
    if ([platform isEqualToString:@"iPhone9,2"]) return @"iPhone 7 Plus";
    
    if ([platform isEqualToString:@"iPod1,1"])   return @"iPod Touch 1G";
    
    if ([platform isEqualToString:@"iPod2,1"])   return @"iPod Touch 2G";
    
    if ([platform isEqualToString:@"iPod3,1"])   return @"iPod Touch 3G";
    
    if ([platform isEqualToString:@"iPod4,1"])   return @"iPod Touch 4G";
    
    if ([platform isEqualToString:@"iPod5,1"])   return @"iPod Touch 5G";
    
    if ([platform isEqualToString:@"iPad1,1"])   return @"iPad 1G";
    
    if ([platform isEqualToString:@"iPad2,1"])   return @"iPad 2";
    
    if ([platform isEqualToString:@"iPad2,2"])   return @"iPad 2";
    
    if ([platform isEqualToString:@"iPad2,3"])   return @"iPad 2";
    
    if ([platform isEqualToString:@"iPad2,4"])   return @"iPad 2";
    
    if ([platform isEqualToString:@"iPad2,5"])   return @"iPad Mini 1G";
    
    if ([platform isEqualToString:@"iPad2,6"])   return @"iPad Mini 1G";
    
    if ([platform isEqualToString:@"iPad2,7"])   return @"iPad Mini 1G";
    
    if ([platform isEqualToString:@"iPad3,1"])   return @"iPad 3";
    
    if ([platform isEqualToString:@"iPad3,2"])   return @"iPad 3";
    
    if ([platform isEqualToString:@"iPad3,3"])   return @"iPad 3";
    
    if ([platform isEqualToString:@"iPad3,4"])   return @"iPad 4";
    
    if ([platform isEqualToString:@"iPad3,5"])   return @"iPad 4";
    
    if ([platform isEqualToString:@"iPad3,6"])   return @"iPad 4";
    
    if ([platform isEqualToString:@"iPad4,1"])   return @"iPad Air";
    
    if ([platform isEqualToString:@"iPad4,2"])   return @"iPad Air";
    
    if ([platform isEqualToString:@"iPad4,3"])   return @"iPad Air";
    
    if ([platform isEqualToString:@"iPad4,4"])   return @"iPad Mini 2G";
    
    if ([platform isEqualToString:@"iPad4,5"])   return @"iPad Mini 2G";
    
    if ([platform isEqualToString:@"iPad4,6"])   return @"iPad Mini 2G";
    
    if ([platform isEqualToString:@"i386"])      return @"iPhone Simulator";
    
    if ([platform isEqualToString:@"x86_64"])    return @"iPhone Simulator";
    
    return platform;
    
}

10.UITableView分类添加方法，实现没有数据界面展示

-(NSInteger)showImageWithName:(NSString *)imageName
         showMessageWithTitle:(NSString *)title
             byDataArrayCount:(NSInteger)count
                      withTop:(CGFloat)top
               withImageWidth:(CGFloat)imageWidth
              withImageHeight:(CGFloat)imageHeigt {
    
    if (count == 0) {
        
        self.backgroundView = ({
            
            UIView *backView = [[UIView alloc] init];
            backView.frame = self.backgroundView.frame;
            UIImageView *imageView = [[UIImageView alloc] init];
            imageView.image = [UIImage imageNamed:imageName];
            [backView addSubview:imageView];
            
            UILabel *label = [[UILabel alloc] init];
            label.text = title;
            [UILabel setLabelTextColor:UIColorFromRGBValue(0x959595) AndFontSize:[self autoScaleW:14] WithLabel:label];
            label.textAlignment = NSTextAlignmentCenter;
            [backView addSubview:label];
            
            [imageView mas_makeConstraints:^(MASConstraintMaker *make) {
               
                make.leading.equalTo(backView).offset((screenW - [self autoScaleW:imageWidth])/2);
                make.top.equalTo([self autoScaleH:top]);
                make.width.equalTo([self autoScaleW:imageWidth]);
                make.height.equalTo([self autoScaleH:imageHeigt]);
            }];
            
            [label mas_makeConstraints:^(MASConstraintMaker *make) {
               
                make.top.equalTo(imageView.bottom).equalTo(10);
                make.leading.equalTo(0);
                make.width.equalTo(screenW);
                make.height.equalTo(21);
            }];
            
            backView;
            
        });
    }else{
        
        self.backgroundView = nil;
    }
    
    return count;
    
}

iOS开发小知识点整理第二期（持续更新）

1.根据时间戳显示不同的时间，如果是今年的时间，则显示月日时分秒，如果是今天的时间，显示时分秒，如果不是今年的时间，则显示年月日时分秒

2.将16进制的字符串转换为UIColor的方法

3.获取网络视频的时间，将其转换为时分格式

4.裁剪网络图片，使其显示在控件上不变形

5.图片裁剪

6.将时间字符串转换为时间戳（format必需和时间字符串时间的格式保持一致）

7.判断手机号的合法性

8.将字符串进行MD5加密

9.手机类型的判断

10.UITableView分类添加方法，实现没有数据界面展示

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