能保存图片到相册吗？或者自定义按钮

[wqforever]

[banchichen]

老哥，来个PR哈

[key-start]

同需

[wqforever]

configBottomToolBar方法里添加

_doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _doneButton.titleLabel.font = [UIFont systemFontOfSize:13];
    [_doneButton addTarget:self action:@selector(doneButtonClick) forControlEvents:UIControlEventTouchUpInside];
    [_doneButton setTitle:@"保存" forState:UIControlStateNormal];
    [_doneButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [_doneButton setBackgroundColor:[UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:0.4]];
    _doneButton.layer.cornerRadius = 3.0f;
    _doneButton.layer.masksToBounds = YES;

再实现保存方法

id photo = _photos[self.currentIndex];
        if ([photo isKindOfClass:[UIImage class]]) {
            UIImageWriteToSavedPhotosAlbum(photo, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
        } else if ([photo isKindOfClass:[NSURL class]]) {
            NSURL *URL = (NSURL *)photo;
            NSString *suffix = [[URL.absoluteString.lowercaseString componentsSeparatedByString:@"."] lastObject];
            if (suffix && [self.videoSuffixs containsObject:suffix]) {
                BOOL compatible = UIVideoAtPathIsCompatibleWithSavedPhotosAlbum([URL path]);
                if (compatible) {
                    UISaveVideoAtPathToSavedPhotosAlbum([URL path], self, @selector(savedPhotoImage:didFinishSavingWithError:contextInfo:), nil);
                } else {
                    [self showHintMessage:@"不支持的类型"];
                }
            } else if ([suffix isEqualToString:@"gif"]) {
                NSData *imageData;
                if ([[SDImageCache sharedImageCache]diskImageDataExistsWithKey:URL.absoluteString]) {
                    imageData = [[SDImageCache sharedImageCache]diskImageDataForKey:URL.absoluteString];
                } else {
                    imageData = [NSData dataWithContentsOfURL:URL];
                }
                ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];
                [library writeImageDataToSavedPhotosAlbum:imageData metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {
                    [self showHintMessage:@"保存成功"];
                }];
            } else {
                UIImage *img;
                if ([[SDImageCache sharedImageCache]diskImageDataExistsWithKey:URL.absoluteString]) {
                    img = [[SDImageCache sharedImageCache]imageFromDiskCacheForKey:URL.absoluteString];
                } else {
                    NSData *data = [NSData dataWithContentsOfURL:URL];
                    img = [UIImage imageWithData:data];
                }
                UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
            }
        } else {
            [self showHintMessage:@"不支持的类型"];
        }