ZYCornerRadius
一句代码，圆角风雨无阻

A Category to make cornerRadius for UIImageView have no Offscreen-Rendered, be more efficiency 避免为UIImageView设置圆角时触发离屏渲染所带来的性能损耗，两种工作方式：Category和UIImageView子类。

CocoaPods:

pod 'ZYCornerRadius', '~> 0.8.1'

性能对比:

测试设备6P，屏幕中有40张尺寸为20*20的小图片，使用masksToBounds切角处理时帧率大大下降至20+，使用ZYCornerRadius时帧率保持在57+，性能接近0损耗。
![](https://raw.githubusercontent.com/liuzhiyi1992/MyStore/master/ZYCornerRadius/ZYCornerRadius%E6%80%A7%E8%83%BD%E5%AF%B9%E6%AF%94.png)

内存使用对比:
![](https://raw.githubusercontent.com/liuzhiyi1992/MyStore/master/ZYCornerRadius/%E5%86%85%E5%AD%98%E4%BD%BF%E7%94%A8%E5%AF%B9%E6%AF%94.jpg)

![](https://raw.githubusercontent.com/liuzhiyi1992/MyStore/master/ZYCornerRadius/zycornerRadius%E6%96%B0demo%E6%BC%94%E7%A4%BA%E5%9B%BE%E7%89%87.jpg)

Usage:

ZYCornerRadius提供两种使用方式

Category方式：
导入头文件
objc #import "UIImageView+CornerRadius.h"
创建圆角半径为6的UIImageView(三种方式)：
```objc
//1
UIImageView *imageView = [UIImageView zy_cornerRadiusAdvance:6.0f rectCornerType:UIRectCornerAllCorners];
imageView.image = [UIImage imageNamed:@"mac_dog"];

//2
UIImageView *imageView = [[UIImageView alloc] initWithCornerRadiusAdvance:6.0f rectCornerType:UIRectCornerAllCorners];
imageView.image = [UIImage imageNamed:@"mac_dog"];

//3
UIImageView *imageView = [[UIImageView alloc] init];
[imageView zy_cornerRadiusAdvance:6.0f rectCornerType:UIRectCornerAllCorners];
imageView.image = [UIImage imageNamed:@"mac_dog"];
创建圆形的UIImageView(三种方式)： objc
//1
UIImageView *imageView = [UIImageView zy_roundingRectImageView];
imageView.image = [UIImage imageNamed:@"mac_dog"];

//2
UIImageView *imageView = [[UIImageView alloc] initWithRoundingRectImageView];
imageView.image = [UIImage imageNamed:@"mac_dog"];

//3
UIImageView *imageView = [[UIImageView alloc] init];
[imageView zy_cornerRadiusRoundingRect];
imageView.image = [UIImage imageNamed:@"mac_dog"];
**子类ZYImageView方式同理：** 导入头文件 objc

import "ZYImageView.h"

使用方式同理  



<br>
<br>
##以下列出ZYCornerRadius所开放的主要的func:  
配置一个圆角UIImageView，传入圆角半径和圆角类型

(UIImageView *)zy_cornerRadiusAdvance:(CGFloat)cornerRadius rectCornerType:(UIRectCorner)rectCornerType;
(instancetype)initWithCornerRadiusAdvance:(CGFloat)cornerRadius rectCornerType:(UIRectCorner)rectCornerType;
配置一个圆形的UIImageView objc
(UIImageView *)zy_roundingRectImageView;
(instancetype)initWithRoundingRectImageView;
直接为UIImageView设置圆角图片，传入UIImage，圆角半径和圆角类型，当次有效 objc
(void)zy_cornerRadiusWithImage:(UIImage *)image cornerRadius:(CGFloat)cornerRadius rectCornerType:(UIRectCorner)rectCornerType;
```

iteration:

0.8.1 - 解决更新图片时图片内容闪动问题。
0.7.1 - 去除部分api，保持使用简洁的设计理念，加入带边框功能
0.6.1 - 解决在TableViewCell被selected后，其中UIImageView的image被重置的问题
0.5.1 - 解决SDWebImage使用placeholder为nil时发生的crash
0.4.1 - 发布第一个较完善版本

Relation:

@liuzhiyi1992 on Github
@Blog Welcome

License:

ZYCornerRadius is released under the MIT license. See LICENSE for details.

ZYCornerRadius 一句代码，圆角风雨无阻