iOS設置圓角的三種方式

iOS切圓角的方式

第一種方法:通過設置layer的屬性

最簡單的一種,但是很影響性能,一般在正常的開發中使用很少.

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
   //只需要設置layer層的兩個屬性
   //設置圓角
    imageView.layer.cornerRadius = imageView.frame.size.width / 2;
   //將多余的部分切掉
    imageView.layer.masksToBounds = YES;
    [self.view addSubview:imageView];

 

第二種方法:使用貝塞爾曲線UIBezierPath和Core Graphics框架畫出一個圓角

   UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    imageView.image = [UIImage imageNamed:@"1"];
    //開始對imageView進行畫圖
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, 1.0);
    //使用貝塞爾曲線畫出一個圓形圖
    [[UIBezierPath bezierPathWithRoundedRect:imageView.bounds cornerRadius:imageView.frame.size.width] addClip];
    [imageView drawRect:imageView.bounds];

    imageView.image = UIGraphicsGetImageFromCurrentImageContext();
     //結束畫圖
    UIGraphicsEndImageContext();
    [self.view addSubview:imageView];

 

第三種方法:使用CAShapeLayer和UIBezierPath設置圓角

首先需要導入<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];
    //設置大小
    maskLayer.frame = imageView.bounds;
    //設置圖形樣子
    maskLayer.path = maskPath.CGPath;
    imageView.layer.mask = maskLayer;
    [self.view addSubview:imageView];
}

 

這三種方法中第三種最好，對內存的消耗最少啊，而且渲染快速