- 常用设置：
//cornerRadius 设置为self.iconImage图片宽度的一半(圆形图片)
self.iconImage.layer.cornerRadius = 20;
self.iconImage.layer.masksToBounds = YES;
- 适用 xib 或者 storyboard
Paste_Image.png
- 绘图做法
使用图层过量会有卡顿现象, 特别是弄圆角或者阴影会很卡, 如果设置图片圆角一般用绘图来做
//写个UIImage分类
#import <UIKit/UIKit.h>
@interface UIImage (myExtension)
+ (UIImage *)cutCircleImage:(NSString *)imageName;
@end
实现
#import "UIImage+myExtension.h"
@implementation UIImage (myExtension)
- (UIImage *)cutCircleImage
{
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);
// 获取上下文
CGContextRef ctr = UIGraphicsGetCurrentContext();
// 设置圆形
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextAddEllipseInRect(ctr, rect);
// 裁剪
CGContextClip(ctr);
// 将图片画上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
+ (UIImage *)cutCircleImage:(NSString *)imageName
{
return [[self imageNamed:imageName] cutCircleImage];
}
@end
使用
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView *imageV = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
imageV.image = [UIImage cutCircleImage:@"flower"];
self.iconImageView = imageV;
[self.view addSubview:self.iconImageView];
}
- 更多介绍
iOS-设置图片圆角的几种方法总结:
http://www.jianshu.com/p/6cf66c95fa4d
iOS图片设置圆角性能问题:
http://www.jianshu.com/p/34189f62bfd8
