How to crop UIImage on oval shape or circle shape?(如何在椭圆形或圆形上裁剪 UIImage?)

本文介绍了如何在椭圆形或圆形上裁剪 UIImage?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

请给出如何在椭圆形或圆形上裁剪 UIImage 的想法.请分享您的想法.

Please give ideas for how to crop UIImage on oval shape or circle shape. Please share your ideas.

推荐答案

#import <QuartzCore/QuartzCore.h>

CALayer *imageLayer = YourImageview.layer;
        [imageLayer setCornerRadius:5];
        [imageLayer setBorderWidth:1];
        [imageLayer setMasksToBounds:YES];

通过增加半径，它会变得更圆.

by increasing radius it will become more round-able.

只要图片是正方形，取一半宽度作为圆角半径就可以得到一个正圆:

As long as the image is a square, you can get a perfect circle by taking half the width as the corner radius: 

[imageView.layer setCornerRadius:imageView.frame.size.width/2];

你还需要添加

[imageView.layer setMasksToBounds:YES];

斯威夫特 4.2

import QuartzCore

var imageLayer: CALayer? = YourImageview.layer
imageLayer?.cornerRadius = 5
imageLayer?.borderWidth = 1
imageLayer?.masksToBounds = true

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