代碼復用

oc 里面無法方法嵌套，可以用block實現(xiàn)代碼復用。

/// 顯示皮膚列表彈窗
- (void)showReaderThemeListView
{
    [self hiddenReaderToolView];

    void (^ showThemeAlertBlock)(void) = ^(void) {
        self.toolTapGR.enabled = NO;
        MJWeakSelf
        HYMoreImageThemeAlertView *alertView = [HYMoreImageThemeAlertView showInView:self.view withThemeList:self.themeListArray closeBlock:^{
            weakSelf.toolTapGR.enabled = YES;
        }];
        alertView.themeChangeBlock = ^{
            [weakSelf moreThemeVCThemeChanged];
        };
    };

    if (self.themeListArray && self.themeListArray.count > 0) {
        showThemeAlertBlock();
    } else {
        MJWeakSelf
        [self getThemeList:^(NSArray<HYImageThemeModel *> *_Nonnull array) {
            if (array && array.count > 0) {
                showThemeAlertBlock();
            } else {
                [HYToastView showRemindMessageToView:weakSelf.view withMessage:@"加載皮膚失敗,請重試!"];
            }
        }];
    }
}

在swift中 方法里面可以嵌套另一個方法。