iOS设置圆形（圆角）UIView、UIButton的简单方法

有时候需要快速的创建一些圆形的UIView，UIButton之类的，如果有时间自己封装控件，使用CG绘制当然很好，但是如果没有时间，那么就使用CALayer的特性来做吧。

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];

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 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, [UIScreen mainScreen].scale);//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，性能最好写，记得导入<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];//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。 iOS© 著作权归作者所有举报文章如果觉得我的文章对您有用，请随意打赏。您的支持将鼓励我继续创作！发个红包喜欢 139