#import <UIKit/UIKit.h>@interface UIImage (image)/** * 生成一張圓形圖片 * * @param image    要裁剪的圖片 * * @return 生成的圓形圖片 */+ (UIImage *)imageWithClipImage:(UIImage *)image;/** * 生成一張帶有邊框的圓形圖片 * * @param borderW   邊框寬度 * @param borderColor 邊框顏色 * @param image    要添加邊框的圖片 * * @return 生成的帶有邊框的圓形圖片 */+ (UIImage *)imageWithBorder:(CGFloat)borderW color:(UIColor *)borderColor image:(UIImage *)image;@end

#import "UIImage+image.h"@implementation UIImage (image)+ (UIImage *)imageWithClipImage:(UIImage *)image{+   //1.開啟跟原始圖片一樣大小的上下文  UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);  //2.設置一個圓形裁剪區域  //2.1繪制一個圓形  UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, image.size.width, image.size.height)];  //2.2.把圓形的路徑設置成裁剪區域  [path addClip];//超過裁剪區域以外的內容都給裁剪掉  //3.把圖片繪制到上下文當中(超過裁剪區域以外的內容都給裁剪掉)  [image drawAtPoint:CGPointZero];  //4.從上下文當中取出圖片  UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();  //5.關閉上下文  UIGraphicsEndImageContext();  return newImage;}+ (UIImage *)imageWithBorder:(CGFloat)borderW color:(UIColor *)borderColor image:(UIImage *)image{  //1.開啟一個上下文  CGSize size = CGSizeMake(image.size.width + 2 * borderW, image.size.height + 2 * borderW);  UIGraphicsBeginImageContextWithOptions(size, NO, 0);  //2.繪制大圓,顯示出來  UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, size.width, size.height)];  [borderColor set];  [path fill];  //3.繪制一個小圓,把小圓設置成裁剪區域  UIBezierPath *clipPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(borderW, borderW, image.size.width, image.size.height)];  [clipPath addClip];  //4.把圖片繪制到上下文當中  [image drawAtPoint:CGPointMake(borderW, borderW)];  //5.從上下文當中取出圖片  UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();  //6.關閉上下文  UIGraphicsEndImageContext();  return newImage;}