(iOS开发）保存图片方法

// 1. 去图像路径
NSArray *docs = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *imagePath = [docs[0]stringByAppendingPathComponent:@"abc.png"];

// 2. 转换成NSData保存
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:imagePath atomically:YES];