iOS设置圆角的三种方式

  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];

 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];

#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];}