- (void)viewDidLoad {  [super viewDidLoad];     //加載圖片  UIImage *image = [UIImage imageNamed:@"菲哥"];     //獲取圖片尺寸  CGSize size = image.size;     //開啟位圖上下文  UIGraphicsBeginImageContextWithOptions(size, NO, 0);     //創(chuàng)建圓形路徑  UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, image.size.width, image.size.height)];     //設(shè)置為裁剪區(qū)域  [path addClip];     //繪制圖片  [image drawAtPoint:CGPointZero];     //獲取裁剪后的圖片  _imageView.image = UIGraphicsGetImageFromCurrentImageContext();     //關(guān)閉上下文  UIGraphicsEndImageContext();   }

- (void)viewDidLoad {  [super viewDidLoad];     //加載圖片  UIImage *image = [UIImage imageNamed:@"大菲哥"];     //設(shè)置邊框?qū)挾? CGFloat border = 3;  CGFloat imageWH = image.size.width;     //計(jì)算外圓的尺寸  CGFloat ovalWH = imageWH + 2 * border;     //開啟上下文  UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);     //畫一個(gè)大的圓形  UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, ovalWH, ovalWH)];     [[UIColor orangeColor]set];     [path fill];     //設(shè)置裁剪區(qū)域  UIBezierPath *path1 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(border, border, imageWH, imageWH)];  [path1 addClip];     //繪制圖片  [image drawAtPoint:CGPointMake(border, border)];     //從上下文中獲取圖片  _imageView.image = UIGraphicsGetImageFromCurrentImageContext();     //關(guān)閉上下文  UIGraphicsEndImageContext();   }

- (void)viewDidLoad {  [super viewDidLoad];     //開啟上下文  UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 0);     //獲取上下文  CGContextRef ctx = UIGraphicsGetCurrentContext();     //把控件上的圖層渲染到上下文  [self.view.layer renderInContext:ctx];     //獲取上下文中的圖片  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();     //關(guān)閉上下文  UIGraphicsEndImageContext();     //保存圖片到相冊  UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);   }