alertDialog示例

1. UIAlertController* alert=[UIAlertController alertControllerWithTitle:@"提示"
2. message:@"是否要重新开始？"
3. preferredStyle:UIAlertControllerStyleAlert];
5. UIAlertAction* defaultAction=[UIAlertAction actionWithTitle:@"是" style:UIAlertActionStyleDefault
6. handler:^(UIAlertAction* action){
7. self.timeLabel.text=@"5";
8. }];
9. UIAlertAction*Action1=[UIAlertAction actionWithTitle:@"取消"
10. style:UIAlertActionStyleCancel
11. handler:^(UIAlertAction*action){
13. }];
15. [alert addAction:defaultAction];
16. [alert addAction:Action1];
17. [self presentViewController:alert animated:YES completion:nil];