也是看到簡書里一哥們的，忘了是誰的了，只是他不會排版，我又給整理了一下！

// 打開相冊
- (IBAction)openPhotoLibiary:(UIButton *)sender

{

    //打開相冊

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    //資源類型為圖片庫

    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    picker.delegate = self;

    //設(shè)置選擇后的圖片可被編輯

    picker.allowsEditing = YES;

    [self presentViewController:picker animated:YES completion:nil];

}

pragma Delegate - 相冊 UIImagePickerControllerDelegate

//圖像選取器的委托方法，選完圖片后回調(diào)該方法

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{

//當(dāng)圖片不為空時顯示圖片并保存圖片

if (image != nil) {

//圖片顯示在界面上

        [changeImg setBackgroundImage:image forState:UIControlStateNormal];

//以下是保存文件到沙盒路徑下

//把圖片轉(zhuǎn)成NSData類型的數(shù)據(jù)來保存文件

NSData *data;

//判斷圖片是不是png格式的文件

if (UIImagePNGRepresentation(image)) {

//返回為png圖像。

data = UIImagePNGRepresentation(image);

}else {

//返回為JPEG圖像。

      data = UIImageJPEGRepresentation(image, 1.0);

}

//保存

//        [[NSFileManager defaultManager] createFileAtPath:self.imagePath contents:data attributes:nil];

}

//關(guān)閉相冊界面

[picker dismissModalViewControllerAnimated:YES];
}