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//第一步：保存头像信息到NSData中
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); self.documentsPath = [paths objectAtIndex:0];
NSString *imagePath = [NSString stringWithFormat:@"%@/%@.jpg", self.documentsPath, contacts.Photo];
UIImage *tempImage = [UIImage imageWithContentsOfFile:imagePath];
headOldImageData = [NSData dataWithData:UIImageJPEGRepresentation(tempImage, 1.0)];
[headOldImageData retain];
//第二步：修改后用writeToFile归档
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原文地址：http://www.cnblogs.com/allanliu/p/4521845.html
