OC 常用方法总结

作者: jiangzz | 来源:发表于2021-02-23 10:13 被阅读0次

一、设置导航栏透明

@property (nonatomic,assign) BOOL isAnimated;
///导航栏透明
- (void)viewWillAppear:(BOOL)animated{
   [super viewWillAppear:animated];
   [self.navigationController setNavigationBarHidden:YES animated:_isAnimated];
   [self setUI];
   [self requestData];
}

- (void)viewWillDisappear:(BOOL)animated{
   [super viewWillDisappear:animated];
   if (self.navigationController.viewControllers.count > 1) {
       _isAnimated = YES;
       [self.navigationController setNavigationBarHidden:NO animated:YES];
   }else{
       _isAnimated = NO;
   }
}

- (void)viewDidLoad {
   [super viewDidLoad];
   self.view.backgroundColor = UIColor.whiteColor;
   _isAnimated = NO;  
}

二、复制到剪切板

UIPasteboard *appPasteBoard =  [UIPasteboard generalPasteboard];
   [appPasteBoard setString:“要复制的文字”];

三、获取AppDelegate

AppDelegate *delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

四、单例的多线程写法

------DataManager.h
+ (instancetype)shareManager

@property (nonatomic, strong) NSString *NAME;

------DataManager.m
#import "DataManager.h"

@interface DataManager()<NSCopying,NSMutableCopying>

@end

static DataManager *manager = nil;

@implementation DataManager

+ (instancetype)shareManager{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        manager = [[self alloc]init];
    });
    return manager;
}

+ (id)allocWithZone:(struct _NSZone *)zone{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        manager = [super allocWithZone:zone];
    });
    return manager;
}
- (nonnull id)copyWithZone:(nullable NSZone *)zone {
    return manager;
}

- (nonnull id)mutableCopyWithZone:(nullable NSZone *)zone {
    return manager;
}
@end

--------main
导入头文件后

ShareManage *manage = [ShareManage shareManager];
manage.NAME = @"测试单例,输出名称";
NSLog(@"------%@-------",manage.NAME)



--------其他页面
ShareManage *manage = [ShareManage shareManager];

NSLog(@"------%@-------",manage.NAME)

可获取NAME属性值

五、倒计时

/// 定时器
@property(nonatomic,strong)dispatch_source_t timer;
///倒计时
-(void)countDownAction{
   if (self.timer) {
          dispatch_cancel(self.timer);
          self.timer = nil;
   }
          
   self.postBut.userInteractionEnabled = NO;
    __block NSInteger count = 60;
   dispatch_queue_t queue = dispatch_get_main_queue();
   //创建一个定时器（dispatch_source_t本质上还是一个OC对象）
   self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
          
   //设置定时器的各种属性
   dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0*NSEC_PER_SEC));
   uint64_t interval = (uint64_t)(1.0*NSEC_PER_SEC);
   dispatch_source_set_timer(self.timer, start, interval, 0);
         
   //设置回调
   __weak typeof(self) weakSelf = self;
   dispatch_source_set_event_handler(self.timer, ^{
      count--;
      if (count==0) {
            dispatch_source_cancel(weakSelf.timer);
            weakSelf.timer = nil;
            [self.postBut setTitle:@"发送验证码" forState:UIControlStateNormal];
            self.postBut.userInteractionEnabled = YES;
      }else{
            [self.postBut setTitle:[NSString stringWithFormat:@"重发(%ld)",(long)count] forState:UIControlStateNormal];
      }
    });
    //启动定时器（默认是暂停）
   dispatch_resume(self.timer);
}

六、富文本字符串拼接

///拼接-工分:
///range富文本
NSString *deposit = [NSString stringWithFormat:@"%@",self.roomDic[@"deposit"]];
_earnestLabel.text = [NSString stringWithFormat:@"定金: %@ 工分",deposit];
    
NSRange tempRange =  [_earnestLabel.text rangeOfString:deposit];

NSMutableAttributedString *attributeStr = [[NSMutableAttributedString alloc]initWithString:_earnestLabel.text];
[attributeStr addAttribute:NSForegroundColorAttributeName value:RGB_COLOR(255, 91, 0) range:tempRange]; [attributeStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:tempRange];
_earnestLabel.attributedText = attributeStr;

七、获取当前时间

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyyMMddHHmmss";
NSString * str = [formatter stringFromDate:[NSDate date]];

八、获取指定view的截图并保存到相册

//传入需要截取的view
-(UIImage *)screenShotView:(UIView *)view{
 UIGraphicsBeginImageContextWithOptions(CGSizeMake(view.frame.size.width,view.frame.size.height ), NO, 0.0); //currentView 当前的view  创建一个基于位图的图形上下文并指定大小为
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];//renderInContext呈现接受者及其子范围到指定的上下文
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();//返回一个基于当前图形上下文的图片
    UIGraphicsEndImageContext();//移除栈顶的基于当前位图的图形上下文
    UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);//然后将该图片保存到图片图
    return viewImage;
}

九、计算文字宽度

NSDictionary *attrs = @{NSFontAttributeName : [UIFont boldSystemFontOfSize:9]};
CGSize size = [cell.shopType.text sizeWithAttributes:attrs];

十、快速获取数组的总和,平均值,最大,最小值

- (void)caculateArray:(NSArray *)array{
    CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
    CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
    CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];
    CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue];
    NSLog(@"%fn%fn%fn%f",sum,avg,max,min);
//    return [NSString stringWithFormat:@"%f",sum];
}

十一、弹出拨打电话

1.NSMutableString *str = [[NSMutableString alloc] initWithFormat:@"telprompt://%@",phoneBumber];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str] options:@{} completionHandler:^(BOOL success) {
            }];
2.NSMutableString *str=[[NSMutableString alloc] initWithFormat:@"telprompt://%@",phoneBumber];
[[UIApplication sharedApplication]openURL:[NSURL URLWithString:str] options:@{} completionHandler:nil];

十二、判断手势方向

CGPoint translation = [scrollView.panGestureRecognizer translationInView:scrollView.superview];
if (translation.y>0) {
       
 //        NSLog(@"----------下-----------");
    
}else if(translation.y<0){
 //        NSLog(@"----------上-----------");
}


///例:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    
    CGPoint translation = [self.bgScrollView.panGestureRecognizer translationInView:_bgScrollView.superview];
    if (translation.y>0) {
        
                NSLog(@"----------下-----------");
        
    }else if(translation.y<0){
                NSLog(@"----------上-----------");
    }
    
}

十三、字符串生成二维码保存到相册

 -(void)generatingTwoDimensionalCode {

    // 创建过滤器
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

    // 过滤器恢复默认
    [filter setDefaults];

    // 给过滤器添加数据
     NSString *string = [NSString stringWithFormat:@"%@",NET_IMAGE(self.dataDic[@"data"][@"code"])];
     NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

     [filter setValue:data forKeyPath:@"inputMessage"];

     // 获取二维码过滤器生成的二维码
     CIImage *image = [filter outputImage];// 此时的 image 是模糊的

     // 高清处理：将获取到的二维码添加到
     UIImage *imagex = [self createNonInterpolatedUIImageFormCIImage:image withSize:300];// withSize 大于等于视图显示的尺寸
     UIImageWriteToSavedPhotosAlbum(imagex, self, @selector(image:didFinishSavingWithError:contextInfo:), (__bridge void *)self);
 }

 //--生成高清二维码
 - (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {

     CGRect extent = CGRectIntegral(image.extent);
     CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

     // 创建 bitmap
     size_t width = CGRectGetWidth(extent) * scale;
     size_t height = CGRectGetHeight(extent) * scale;
     CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
     CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
     CIContext *context = [CIContext contextWithOptions:nil];
     CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
     CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
     CGContextScaleCTM(bitmapRef, scale, scale);
     CGContextDrawImage(bitmapRef, extent, bitmapImage);

     // 保存 bitmap 到图片
     CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
     CGContextRelease(bitmapRef);
     CGImageRelease(bitmapImage);
     return [UIImage imageWithCGImage:scaledImage];


 }

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{

    NSLog(@"image = %@, error = %@, contextInfo = %@", image, error, contextInfo);

}

- (void)loadImageFinished:(UIImage *)image{

    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), (__bridge void *)self);

}

十四、数组拼接、字符串分割

///数组以某个元素拼接
[dic setObject:[imageArr componentsJoinedByString:@","] forKey:@"img"];
///字符串以某元素分割
NSArray *imgArr = [NSArray array];
imgArr = [self.postDataArr[indexPath.row][@"img"] componentsSeparatedByString:@","];

十五、随机颜色

- (UIColor *)randomColor{
    return [UIColor colorWithRed:((float)arc4random_uniform(256) / 255.0) green:((float)arc4random_uniform(256) / 255.0) blue:((float)arc4random_uniform(256) / 255.0) alpha:1.0];
}

十六、通知

实现方法.m
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(action) name:@"JUMPTOHOME" object:nil];
-(void)action {
  ///通知执行的方法
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter]removeObserver:self name:@"JUMPTOHOME" object:nil];
}

调用.m
[[NSNotificationCenter defaultCenter]postNotificationName:@"JUMPTOHOME" object:nil];

十七、修改字符串中的字符(修改相同的每个字符为另一字符)

NSString *phoneStr = [self.phoneTF.text stringByReplacingOccurrencesOfString:@" " withString:@""];

十八、延时器

//第一种:
[self performSelector:@selector(nextQuestion:) withObject:nil afterDelay:2.0];
//第二种:
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    //需要调用的方法
});

//第三种:
dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.1/*延迟执行时间*/ * NSEC_PER_SEC));
dispatch_after(delayTime, dispatch_get_main_queue(), ^{
    [self.textField becomeFirstResponder];
});

十九、引入WKwebView 手机适配防止超出屏幕边界

-(WKWebView *)webView {
    if (!_webView) {
        NSString *jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
        
        WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
        WKUserContentController *wkUController = [[WKUserContentController alloc] init];
        [wkUController addUserScript:wkUScript];
        WKWebViewConfiguration *wkWebConfig = [[WKWebViewConfiguration alloc] init];
        wkWebConfig.userContentController = wkUController;
        _webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:wkWebConfig];
//        _webView.userInteractionEnabled = NO;
        _webView.navigationDelegate = self;
        _webView.scrollView.bounces = NO;
        _webView.scrollView.alwaysBounceVertical = NO;
//        _webView.scrollView.scrollEnabled = NO;
        _webView.UIDelegate = self;
        [_webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:NULL];
        [_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[self.url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];
        
    }
    return _webView;
}

二十、应用间的跳转

NSURL *URL = [NSURL URLWithString:@"appB://ios.myapp.cn"];
[[UIApplication sharedApplication] openURL:URL];

二十一、手势识别

UITapGestureRecognizer(点按)
UILongPressGestureRecognizer(长按)
UISwipeGestureRecognizer(轻扫)
UIRotationGestureRecognizer(旋转)
UIPanGestureRecognizer(拖动)
UIPinchGestureRecognizer(捏合，用于缩放)

例：长按手势

//1.创建一个手势 并且监听
 UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
//最小触发 按压的时间
 longPress.minimumPressDuration = 2.0;
//允许多大范围内 触发
 longPress.allowableMovement =  20;
//2.添加到当前你想 操作的控件上
 [self.myImageVIew addGestureRecognizer:longPress];

二十二、点击tableviewCell,collectionView 滚动到固定的session

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    
    UICollectionViewLayoutAttributes*attributes = [self.collectionView layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:indexPath.row]];

    CGRect rect = attributes.frame;

    [self.collectionView setContentOffset:CGPointMake(self.collectionView.frame.origin.x, rect.origin.y - 28) animated:YES];
    
}
 注：28: session 头高度

二十三、collectionView 获取当前点击的item

SelectMultipleCategoriesCollectionViewCell * cell = (SelectMultipleCategoriesCollectionViewCell *)[self collectionView:collectionView cellForItemAtIndexPath:indexPath];

二十四、NSUserDefaults存取

[[NSUserDefaults standardUserDefaults] setObject:@"exampleObject" forKey:@"exampleKey"];//存
[[NSUserDefaults standardUserDefaults] objectForKey:@"exampleKey"];//取
[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"exampleKey"];//移除

///写入
//1. 获取系统的偏好设置对象   
   NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
//2. 存储数据
   [defaults setObject:@"小明" forKey:@"name"];    
   [defaults setInteger:100 forKey:@"age"];    
   [defaults setBool:NO forKey:@"isTrue"];    
//3.立即同步:  强制写入
   [defaults synchronize];

///读取
//1.获取到偏好设置的路径    
   NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

//2.读取数据
   NSString *name =  [defaults objectForKey:@"name"];
   NSInteger age = [defaults integerForKey:@"age"];
   BOOL isTrue = [defaults boolForKey:@"isTrue"];

二十五、tableview 滚动到指定行

[self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:self.commendDataArr.count -1 inSection:0] animated:YES scrollPosition:UITableViewScrollPositionMiddle];

二十六、TextField 限制只可输入数字

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    
    NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789\b"];
    string = [string stringByReplacingOccurrencesOfString:@" " withString:@""];
    
    if ([string rangeOfCharacterFromSet:[characterSet invertedSet]].location != NSNotFound) {
        return NO;
    }

    return YES;
}

二十七、WriteToFile

///写入数据
//1.1 你需要获取路径
   NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

// .XXX 尾椎 只是决定 以哪中方式查看数据, 对存入的数据本身没有影响    
   NSString *fiflePath = [path stringByAppendingPathComponent:@"data.XXX"];
   
//1.2 写数据
   NSArray *dataArray = @[@"亚洲国际舞王尼古拉斯赵四",@"小明",@"老王",@"霜霜"];       //1.3 存    //atomically 原子性的,数据安全的, 百分之九十九都是YES
   [dataArray writeToFile:fiflePath atomically:YES];

///读取数据
//1.读取路径    
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *fiflePath = [path stringByAppendingPathComponent:@"data.XXX"];

 //2.取出来
NSArray *dataArray = [NSArray arrayWithContentsOfFile:fiflePath];

二十八、价格键盘只可输入数字和点

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    BOOL isHaveDian;

    //判断是否有小数点
    if ([textField.text containsString:@"."]) {
        isHaveDian = YES;
    }else{
        isHaveDian = NO;
    }

    if (string.length > 0) {

        //当前输入的字符
        unichar single = [string characterAtIndex:0];
        NSLog(@"single = %c",single);

        //不能输入.0~9以外的字符
        if (!((single >= '0' && single <= '9') || single == '.')){
            NSLog(@"您输入的格式不正确");
            return NO;
        }

        //只能有一个小数点
        if (isHaveDian && single == '.') {
            NSLog(@"只能输入一个小数点");
            return NO;
        }

        //如果第一位是.则前面加上0
        if ((textField.text.length == 0) && (single == '.')) {
            textField.text = @"0";
        }

        //如果第一位是0则后面必须输入.
        if ([textField.text hasPrefix:@"0"]) {
            if (textField.text.length > 1) {
                NSString *secondStr = [textField.text substringWithRange:NSMakeRange(1, 1)];
                if (![secondStr isEqualToString:@"."]) {
                    NSLog(@"第二个字符必须是小数点");
                    return NO;
                }
            }else{
                if (![string isEqualToString:@"."]) {
                    NSLog(@"第二个字符必须是小数点");
                    return NO;
                }
            }
        }

        //小数点后最多能输入两位
        if (isHaveDian) {
            NSRange ran = [textField.text rangeOfString:@"."];
            //由于range.location是NSUInteger类型的，所以不能通过(range.location - ran.location) > 2来判断
            if (range.location > ran.location) {
                if ([textField.text pathExtension].length > 1) {
                    NSLog(@"小数点后最多有两位小数");
                    return NO;
                }
            }
        }

    }

    return YES;
}

END

OC 常用方法总结

一、设置导航栏透明

二、复制到剪切板

三、获取AppDelegate

四、单例的多线程写法

五、倒计时

六、富文本字符串拼接

七、获取当前时间

八、获取指定view的截图并保存到相册

九、计算文字宽度

十、快速获取数组的总和,平均值,最大,最小值

十一、弹出拨打电话

十二、判断手势方向

十三、字符串生成二维码保存到相册

十四、数组拼接、字符串分割

十五、随机颜色

十六、通知

十七、修改字符串中的字符(修改相同的每个字符为另一字符)

十八、延时器

十九、引入WKwebView 手机适配防止超出屏幕边界

二十、应用间的跳转

二十一、手势识别

二十二、点击tableviewCell,collectionView 滚动到固定的session

二十三、collectionView 获取当前点击的item

二十四、NSUserDefaults存取

二十五、tableview 滚动到指定行

二十六、TextField 限制只可输入数字

二十七、WriteToFile

二十八、价格键盘只可输入数字和点

相关文章

网友评论

延伸阅读

深度阅读

栏目导航

热点阅读

OC 常用方法总结

一、设置导航栏透明

二、复制到剪切板

三、获取AppDelegate

四、单例的多线程写法

五、倒计时

六、富文本 字符串拼接

七、获取当前时间

八、获取指定view的截图并保存到相册

九、计算文字宽度

十、快速获取数组的总和,平均值,最大,最小值

十一、弹出拨打电话

十二、判断手势方向

十三、字符串生成二维码保存到相册

十四、数组拼接、字符串分割

十五、随机颜色

十六、通知

十七、修改字符串中的字符(修改相同的每个字符为另一字符)

十八、延时器

十九、引入WKwebView 手机适配 防止超出屏幕边界

二十、应用间的跳转

二十一、手势识别

二十二、点击tableviewCell,collectionView 滚动到固定的session

二十三、collectionView 获取当前点击的item

二十四、NSUserDefaults存取

二十五、tableview 滚动到指定行

二十六、TextField 限制只可输入数字

二十七、WriteToFile

二十八、价格键盘只可输入数字和点

相关文章

网友评论

延伸阅读

深度阅读

栏目导航

热点阅读

六、富文本字符串拼接

十九、引入WKwebView 手机适配防止超出屏幕边界