UIAlert

轉自：https://blog.csdn.net/deng0zhaotai/article/details/53887508

通過uialertcontroller實作三種簡易彈框

（一）警告類

- (IBAction)showAlert:(UIButton *)sender {
    //顯示提示框
    //過時
//    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title" message:@"message" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];
//    [alert show];
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"
                                                                   message:@"This is an alert."
                                                            preferredStyle:UIAlertControllerStyleAlert];
    
    UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction * action) {
                                                              //響應事件
                                                              NSLog(@"action = %@", action);
                                                          }];
    UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction * action) {
                                                              //響應事件
                                                              NSLog(@"action = %@", action);
                                                          }];
 
    [alert addAction:defaultAction];
    [alert addAction:cancelAction];
    [self presentViewController:alert animated:YES completion:nil];
}      

（二）帶輸入框警告類

- (IBAction)showList:(UIButton *)sender {
    //提示框添加文本輸入框
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"
                                                                   message:@"This is an alert."
                                                            preferredStyle:UIAlertControllerStyleAlert];
    
    UIAlertAction* okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction * action) {
                                                              //響應事件
                                                              //得到文本資訊
                                                              for(UITextField *text in alert.textFields){
                                                                  NSLog(@"text = %@", text.text);
                                                              }
                                                          }];
    UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel
                                                         handler:^(UIAlertAction * action) {
                                                             //響應事件
                                                             NSLog(@"action = %@", alert.textFields);
                                                         }];
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"登入";
    }];
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"密碼";
        textField.secureTextEntry = YES;
    }];
    
    [alert addAction:okAction];
    [alert addAction:cancelAction];
    [self presentViewController:alert animated:YES completion:nil];
 
}      

（三）操作清單類

- (IBAction)showSheet:(UIButton *)sender {
    //顯示彈出框清單選擇
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"
                                                                   message:@"This is an Sheet."
                                                            preferredStyle:UIAlertControllerStyleActionSheet];
    
    UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel
                                                          handler:^(UIAlertAction * action) {
                                                              //響應事件
                                                              NSLog(@"action = %@", action);
                                                          }];
    UIAlertAction* deleteAction = [UIAlertAction actionWithTitle:@"删除" style:UIAlertActionStyleDestructive
                                                         handler:^(UIAlertAction * action) {
                                                             //響應事件
                                                             NSLog(@"action = %@", action);
                                                         }];
    UIAlertAction* saveAction = [UIAlertAction actionWithTitle:@"儲存" style:UIAlertActionStyleDefault
                                                         handler:^(UIAlertAction * action) {
                                                             //響應事件
                                                             NSLog(@"action = %@", action);
                                                         }];
    [alert addAction:saveAction];
    [alert addAction:cancelAction];
    [alert addAction:deleteAction];
    [self presentViewController:alert animated:YES completion:nil];
}