IOS开发之UIAlertView与UIAlertController的详尽用法说明

    // Newly initialized alert view.
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Edit" message:@"Please Modify the Info" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Sure", @"Other", nil];
    
    // 为下面修改数据用
    // This property is inherited from the UIView, You can use this property to distinguish when a AlertView has multiple view
    alertView.tag = indexPath.row;
    
    // Adds a button to the receiver with the given title.
    [alertView addButtonWithTitle:@"addBtn"];
    
    /**
     UIAlertViewStyle = 以下4种
     UIAlertViewStyleDefault,
     UIAlertViewStyleSecureTextInput,       //密码输入框风格
     UIAlertViewStylePlainTextInput,        //普通输入框风格
     UIAlertViewStyleLoginAndPasswordInput  //账号密码框风格
     */
    // An alert that allows the user to enter text. Available in iOS 5.0 and later.
    alertView.alertViewStyle = UIAlertViewStylePlainTextInput;
    
    // Returns the text field at the given index
    UITextField *textField = [alertView textFieldAtIndex:0];
    textField.text = model.title;
    
    // The number of buttons on the alert view. (read-only)
    NSLog(@"The total number of button is : %ld", alertView.numberOfButtons);
    
    // Returns the title of the button at the given index.
    NSLog(@"The button title at the specified index : %@", [alertView buttonTitleAtIndex:1]);
    
    // The index number of the cancel button.
    NSLog(@"Index for the cancel button is : %ld",alertView.cancelButtonIndex);
    
    // -1 if no otherButtonTitles or initWithTitle:... not used
    NSLog(@"The index of the first other button is (read-only) : %ld",alertView.firstOtherButtonIndex);
    
    // show UIAlertView
    [alertView show];

// 1.实例化alert:alertControllerWithTitle
UIAlertController *alertControl = [UIAlertController alertControllerWithTitle:@"编辑" message:@"请修改菜单名称:" preferredStyle:UIAlertControllerStyleAlert];

// 2.实例化按钮:actionWithTitle
// 为防止block与控制器间循环引用，我们这里需用__weak来预防
__weak typeof(alert) wAlert = alert;
    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {
        // 点击确定按钮的时候, 会调用这个block
        NSLog(@"%@",[wAlert.textFields.firstObject text]);
        
    }]];

    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];

    // 添加文本框(只能添加到UIAlertControllerStyleAlert的样式，如果是preferredStyle:UIAlertControllerStyleActionSheet则会崩溃)
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        
        textField.text = model.title;
        
        //监听文字改变的方法
        [textField addTarget:self action:@selector(textFieldsValueDidChange:) forControlEvents:UIControlEventEditingChanged];
    }];

    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        
        textField.secureTextEntry = YES;  // 密文形式显示
        textField.text = model.price;
    }];

// 3.显示alertController:presentViewController
[self presentViewController:alert animated:YES completion:nil];