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iOS切圆角的方式 第一种方法:通过设置layer的属性最简单的一种,但是很影响性能,一般在正常的开发中使用很少. UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; //只需要设置layer层的两个属性 //设置圆角 imageView.layer.cornerRadius = imageView.frame.size.width / 2; //将多余的部分切掉 imageView.layer.masksToBounds = YES; [self.view addSubview:imageView];
第二种方法:使用贝塞尔曲线UIBezierPath和Core Graphics框架画出一个圆角 UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)]; imageView.image = [UIImage imageNamed:@'1']; //开始对imageView进行画图 UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, 1.0); //使用贝塞尔曲线画出一个圆形图 [[UIBezierPath bezierPathWithRoundedRect:imageView.bounds cornerRadius:imageView.frame.size.width] addClip]; [imageView drawRect:imageView.bounds]; imageView.image = UIGraphicsGetImageFromCurrentImageContext(); //结束画图 UIGraphicsEndImageContext(); [self.view addSubview:imageView];
第三种方法:使用CAShapeLayer和UIBezierPath设置圆角首先需要导入 #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]; //设置大小 maskLayer.frame = imageView.bounds; //设置图形样子 maskLayer.path = maskPath.CGPath; imageView.layer.mask = maskLayer; [self.view addSubview:imageView];}
这三种方法中第三种最好，对内存的消耗最少啊，而且渲染快速。
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