iOS开发之UIAlertController报错原因

1、报错信息：Actions added to UIAlertController of style UIAlertActionStyleCancel must have a title when running in UIUserInterfaceIdiomPad

这是由于取消标题（cancelTitle）为空导致的

if (cancelTitle.length > 0) {

　　UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:cancelTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {         

 　　}];

　　[alertCtl addAction:actionCancel];

}

 

2、报错信息：UIAlertController can only have one action with a style of UIAlertActionStyleCancel

这是添加了多个UIAlertActionStyleCancel类型的选项，去掉多余的保留一个即可