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UIKit

  • 调整UILabel的行间距

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    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];      
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]initWithString:_placeHolderLable.text];    

    [paragraphStyle setLineSpacing:20]; // 调整行间距   

    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [_placeHolderLable.text length])];   
    _placeHolderLable.attributedText = attributedString;    
    [self.textView addSubview:_placeHolderLable];   
    [_placeHolderLable sizeToFit];

  • 隐藏状态栏

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    [[UIApplication shareApplication] setStatusBarHidden: YES animated:NO];

  • 圆角按钮

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    UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

  • 取消UITableView分割线左边的15像素

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    - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
    {
        if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
            [cell setSeparatorInset:UIEdgeInsetsZero];
        }

        if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
            [cell setLayoutMargins:UIEdgeInsetsZero];
        }
    }

    // 并且 在ViewDidLoad里面调用下面方法即可  此种去间距操作仅适用与iOS8 以上 iOS7 只需设置setSeparatorInset:UIEdgeInsetsZero 就能将空白去掉

    -(void)cancelMarginsForTableView
    {
        if ([self.menageTable respondsToSelector:@selector(setSeparatorInset:)]) {
            [self.menageTable setSeparatorInset:UIEdgeInsetsZero];
        }
        if ([self.menageTable respondsToSelector:@selector(setLayoutMargins:)]) {
            [self.menageTable setLayoutMargins:UIEdgeInsetsZero];
        }
    }

  • 新增IB辅助线

    • 选中某个需要作为参照物的控件
    • 点击菜单栏 Editor -> Guides -> Add vertical guides （或者 Add Horizonal guides）。

  • 代码定义constraints时，需要设置translatesAutoresizingMaskIntoConstraints为YES。

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    -setTranslatesAutoresizingMaskIntoConstraints:

UIImage

  • UIView 生成 UIImage

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    - (UIImage *)imageFromView: (UIView *) theView
    {
       UIGraphicsBeginImageContext(theView.frame.size);
        CGContextRef context = UIGraphicsGetCurrentContext();
        [theView.layer renderInContext:context];
        UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
       return theImage;
    }

  • 从文件获取图片

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    NSString *thumbnailFile = [NSString stringWithFormat:@"%@/%@.png", [[NSBundle mainBundle] resourcePath], fileName];
    UIImage *thumbnail = [UIImage imageWithContentsOfFile:thumbnailFile];
    UIImage *image = [[UIImage alloc] initWithContentsOfFile:filePath];

  • 生成纯色图

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    CGSize imageSize = CGSizeMake(100, 100);  
    UIGraphicsBeginImageContextWithOptions(imageSize, 0, [UIScreen mainScreen].scale);  
    [[UIColor colorWithRed:0 green:0 blue:0 alpha:1.0] set];  
    UIRectFill(CGRectMake(0, 0, imageSize.width, imageSize.height));  
    UIImage *pressedColorImg = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();

  • 图片合成

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    - (UIImage *)addImage:(UIImage *)image1 toImage:(UIImage *)image2 {  
        UIGraphicsBeginImageContext(image1.size);  
        [image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];  
        [image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];  
        UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();  
        UIGraphicsEndImageContext();  
        return resultingImage;  
    }

  • 截取部分UIImage

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    -(UIImage *)clipImageFromImage:(UIImage *)orgImage  Rect:(CGRect)clipRect{  
        CGImageRef imageRef = orgImage.CGImage;  
        CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, clipRect);  
        CGSize size;  
        size = clipRect.size;  
        UIGraphicsBeginImageContext(size);  
        CGContextRef context = UIGraphicsGetCurrentContext();  
        CGContextDrawImage(context, clipRect, subImageRef);  
        UIImage* clipImage = [UIImage imageWithCGImage:subImageRef];  
        CGImageRelease(subImageRef);  
        UIGraphicsEndImageContext();  
        return clipImage;  
    }

  • 图片模糊处理
    注意:此方法需要导入 CoreImage的framework

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    #import <CoreImage/CoreImage.h>

    // 图片模糊化处理  边缘模糊
    - (UIImage*) blur:(UIImage*)theImage{
        CIContext *context = [CIContext contextWithOptions:nil];
        CIImage *inputImage = [CIImage imageWithCGImage:theImage.CGImage];
        CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
        [blurFilter setValue:inputImage forKey:kCIInputImageKey];
        [blurFilter setValue:[NSNumber numberWithFloat:10.0f] forKey:@"inputRadius"];    CIImage *result = [blurFilter valueForKey:kCIOutputImageKey];    CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]];    UIImage *returnImage = [UIImage imageWithCGImage:cgImage];    CGImageRelease(cgImage);
        return returnImage;
    }
    // 全部模糊
    - (UIImage*) blur:(UIImage*)theImage
    {
        CIContext *context = [CIContext contextWithOptions:nil];
        CIImage *inputImage = [CIImage imageWithCGImage:theImage.CGImage];
        CIFilter *affineClampFilter = [CIFilter filterWithName:@"CIAffineClamp"];
        CGAffineTransform xform = CGAffineTransformMakeScale(1.0, 1.0);
        [affineClampFilter setValue:inputImage forKey:kCIInputImageKey];
        [affineClampFilter setValue:[NSValue valueWithBytes:&xform                                               objCType:@encode(CGAffineTransform)]                         forKey:@"inputTransform"];
        CIImage *extendedImage = [affineClampFilter valueForKey:kCIOutputImageKey];
        CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
        [blurFilter setValue:extendedImage forKey:kCIInputImageKey];
        [blurFilter setValue:[NSNumber numberWithFloat:20.0] forKey:@"inputRadius"];
        CIImage *result = [blurFilter valueForKey:kCIOutputImageKey];
        CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]];
        UIImage *returnImage = [UIImage imageWithCGImage:cgImage];
        CGImageRelease(cgImage);  // 一定要释放 凡是调用C语言的库实例化的对象 到最后都需要手动进行释放,否则会有内存问题  即便是ARC模式下
        return returnImage;
    }

UIWebview

  • UIWebview打开doc,pdf文件

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    UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 55, 320, 300)];
    webView.delegate = self;
    webView.multipleTouchEnabled = YES;
    webView.scalesPageToFit = YES;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *docPath = [documentsDirectory stringByAppendingString:@"/doc2003_1.doc"];    
    NSLog(@"#######%@",docPath);
    NSURL *url = [NSURL fileURLWithPath:docPath];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [webView loadRequest:request];
    [self.view addSubview:webView];

调用系统API

  • 拨打电话

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    - (IBAction)onClickCallPhone:(id)sender {    
         NSString *url = [NSString stringWithFormat:@"telprompt://%@",self.phoneNumField.text];   
         [self openUrl:url];
    }

  • 发送短信

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    - (IBAction)onClickSendMsg:(id)sender {  
          NSString *url = [NSString stringWithFormat:@"sms://%@",self.phoneNumField.text];   
         [self openUrl:url];
    }

  • 发送邮件

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    - (IBAction)onClickEmail:(id)sender {    
        NSString *url = [NSString stringWithFormat:@"mailto://%@",self.phoneNumField.text];   
       [self openUrl:url];
    }

  • 浏览网页

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    - (IBAction)onClickBrowser:(id)sender {  
        NSString *url = @"http://www.baidu.com";   
        [self openUrl:url];
    }

    -(void)openUrl:(NSString *)urlStr{  
        // 注意url中包含协议名称，iOS根据协议确定调用哪个应用，例如发送邮件是“sms://”其中“//”可以省略写成“sms:”(其他协议也是如此)    
        NSURL *url = [NSURL URLWithString:urlStr];    
        UIApplication *application = [UIApplication sharedApplication];    
        if (![application canOpenURL:url]) {        
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:@"无法打开" delegate:self cancelButtonTitle:@"返回" otherButtonTitles:nil];       
            [alert show];     
            return;    
        }    
        [[UIApplication sharedApplication]openURL:url];
    }

Foundation

  • NSDate NSString 互转

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    // NSDate -> NSString
    + (NSString *)stringFromDate:(NSDate *)date {
        // [NSDateFormatter new]效率较低，如果调用次数很多，应使用一个静态实例
        NSDateFormatter *formatter = [NSDateFormatter new];
        [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
        NSString *strDate = [formatter stringFromDate:date];
        return strDate;
    }

    // NSString -> NSDate
    + (NSDate *)dateFromString:(NSString *)string {
        NSDateFormatter *formatter = [NSDateFormatter new];
        [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
        NSDate *date = [formatter dateFromString:string];
        return date;
    }

  • 给文字添加下划线

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    /**
     *  给文字添加下划线
     *  @param aString 要添加下划线的字符串
     *  @return 属性字符串
     */
    -(NSAttributedString *)addUnderLineForLabel:(NSString *)aString
    {
        NSMutableAttributedString *content = [[NSMutableAttributedString alloc] initWithString:aString];
        NSRange contentRange = {0, [content length]};
        [content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];
        [content
         addAttribute:NSUnderlineColorAttributeName value:[UIColor blueColor] range:contentRange];
        return content;
    }

其它

  • 把CGRect结构转变为格式化字符串

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    NSStringFromCGRect(someCG);

  • 由字符串恢复出矩形

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    CGRectFromString(aString)

  • 读取plist文件并转化为NSDictionary

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    NSString *documentsPath = [self getDocumentsDirectory];
    NSString *fullPath = [documentsPath stringByAppendingPathComponent:@"save.plist"];
    NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];

  • 播放音效

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    NSString *musicFilePath = [[NSBundle mainBundle] pathForResource:fileName ofType:@"wav"];       // 创建音乐文件路径
    NSURL *musicURL = [[NSURL alloc] initFileURLWithPath:musicFilePath]; 
    AVAudioPlayer* musicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:nil];
    [musicPlayer prepareToPlay];
    [musicPlayer setVolume:1];          // 设置音量大小
    musicPlayer .numberOfLoops = -1;    // 设置音乐播放次数  -1为一直循环

iOS 开发路线

iOS 开发路线