iOS設置圓形（圓角）UIView、UIButton的簡單方法

有時候需要快速的創建一些圓形的UIView，UIButton之類的，如果有時間自己封裝控件，使用CG繪製當然很好，但是如果沒有時間，那麼就使用CALayer的特性來做吧。

  UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
   //只需要設置layer層的兩個屬性
   //設置圓角
    imageView.layer.cornerRadius = imageView.frame.size.width / 2;
   //將多餘的部分切掉
    imageView.layer.masksToBounds = YES;
    [self.view addSubview:imageView];




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 UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    imageView.image = [UIImage imageNamed:@"1"];
    //開始對imageView進行畫圖
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, [UIScreen mainScreen].scale);
    //使用貝塞爾曲線畫出一個圓形圖
    [[UIBezierPath bezierPathWithRoundedRect:imageView.bounds cornerRadius:imageView.frame.size.width] addClip];
    [imageView drawRect:imageView.bounds];

    imageView.image = UIGraphicsGetImageFromCurrentImageContext();
     //結束畫圖
    UIGraphicsEndImageContext();
    [self.view addSubview:imageView];

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第三種方法，性能最好寫，記得導入<AVFoundation/AVFoundation.h>

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    imageView.image = [UIImage imageNamed:@"1"];
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:imageView.bounds.size];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc]init];
    //設置大小
    maskLayer.frame = imageView.bounds;
    //設置圖形樣子
    maskLayer.path = maskPath.CGPath;
    imageView.layer.mask = maskLayer;
    [self.view addSubview:imageView];
}

這三種方法中第三種最好，對內存的消耗最少啊，而且渲染快速。

 iOS

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