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