iOS設定圓角的三種方式，ios圓角三種方式

iOS設定圓角的三種方式，ios圓角三種方式

第一種方法:通過設定layer的屬性

最簡單的一種,但是很影響效能,一般在正常的開發中使用很少.

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

第二種方法:使用貝茲路徑UIBezierPath和Core Graphics架構畫出一個圓角

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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); //使用貝茲路徑畫出一個圓形圖 [[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設定圓角

#import "ViewController.h"#import <AVFoundation/AVFoundation.h>@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {        [super viewDidLoad];        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 200, 100)];    imageView.image = [UIImage imageNamed:@"1"];    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerTopLeft cornerRadii:CGSizeMake(25, 5)];    CAShapeLayer *maskLayer = [[CAShapeLayer alloc]init];    maskLayer.frame = imageView.bounds;    maskLayer.path = maskPath.CGPath;    imageView.layer.mask = maskLayer;    [self.view addSubview:imageView];}

這三種方法中第三種最好，對記憶體的消耗最少啊，而且渲染快速。

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