UIAlertController的使用

UIAlertController *alert = [UIAlertController
alertControllerWithTitle:@"确定删除此分类吗？"
message:nil
preferredStyle:UIAlertControllerStyleAlert];

[alert addAction:[UIAlertAction
actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *
_Nonnull action) {
[self
shanChunFenLei];
}]];

[alert addAction:[UIAlertAction
actionWithTitle:@"取消"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *
_Nonnull action) {

}]];

[self
presentViewController:alert
animated:YES
completion:nil];