代码如下：
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| UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"My Alert"
message:@"This is an alert."
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {}];
[alert addAction:defaultAction];
[self presentViewController:alert animated:YES completion:nil];
|
UIAlertControllerStyle
其中 UIAlertControllerStyle 枚举效果如下：
UIAlertActionStyle
- UIAlertActionStyleDefault
- UIAlertActionStyleCancel
- UIAlertActionStyleDestructive
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| UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"My Alert message" message:@"This is an alert" preferredStyle:(UIAlertControllerStyleActionSheet)];
UIAlertAction *defaultAction = [UIAlertAction actionWithTitle:@"OK" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"OK" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction * _Nonnull action) {
}];
UIAlertAction *destructiveAction = [UIAlertAction actionWithTitle:@"OK" style:(UIAlertActionStyleDestructive) handler:^(UIAlertAction * _Nonnull action) {
}];
[alert addAction:defaultAction];
[alert addAction:cancelAction];
[alert addAction:destructiveAction];
[self presentViewController:alert animated:YES completion:^{
}];
|
UIAlertActionStyleCancel 类型的 UIAlertAction 对象只能有一个，其他类型的 UIAlertAction 对象可以有多个
