iOS圓形圖片裁剪，以及原型圖片外面加一個圓環

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廢話不多說，直接上代碼

#import "ViewController.h"@interface ViewController ()@property (nonatomic,strong)UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];    [self.view addSubview:self.imageView];        [self yuan];    }/** *  在圓形外面加一個圓環 */- (void)yuanHuan{    //0.載入圖片    UIImage *image = [UIImage imageNamed:@"AppIcon1024"];    //圖片的寬度    CGFloat imageWH = image.size.width;    //設定圓環的寬度    CGFloat border = 1;    //大圓形的寬度高度    CGFloat ovalWH = imageWH + 2 * border;        //1、開啟位元影像上下文    UIGraphicsBeginImageContextWithOptions(CGSizeMake(ovalWH, ovalWH), NO, 0);        //2、畫大圓    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, ovalWH, ovalWH)];    [[UIColor redColor] set];    [path fill];        //3、設定裁剪區（小圓）    UIBezierPath *clipPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(border, border, imageWH, imageWH)];        [clipPath addClip];        //4、繪製圖片    [image drawAtPoint:CGPointMake(border, border)];        //5、擷取圖片    UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();        //6、關閉上下文    UIGraphicsEndImageContext();            self.imageView.image = clipImage;}/** *  裁剪一個原型圖片 */- (void)yuan{    //擷取圖片    UIImage *image = [UIImage imageNamed:@"AppIcon1024"];    //1.開啟位元影像上下文，跟圖片尺寸大小一樣    //NO:不透明  0：scale不縮放    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);    //2.設定圖形裁剪地區，正切圖片    //2.1建立一個圓形路徑    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, image.size.width, image.size.width)];    //2.2把路徑設定裁剪區    [path addClip];    //3.繪製圖片    [image drawAtPoint:CGPointMake(0, 0)];    //4.從上下文中擷取圖片    UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();    //5.關閉上下文    UIGraphicsEndImageContext();        _imageView.image = clipImage;    }- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

源碼：https://github.com/TianHero/caijian.git

iOS圓形圖片裁剪，以及原型圖片外面加一個圓環