OC 常用方法总结

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