关于iOS UIVisualEffectView 切指定角的圆角的问题

Question

在使用UIVisualEffectView是 使用贝塞尔曲线切左上和右上两个圆角 会影响UIVisualEffectView的效果

Answer 1

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.<pre t="code" l="cpp">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<pre t="code" l="cpp">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:使用CAShapeLayer和UIBezierPath设置圆角首先需要导入<AVFoundation/AVFoundation.h><pre t="code" l="cpp">#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