UITextView委托方法 [英] UITextView delegate methods

问题描述

我正在尝试使委托方法与UITextView一起使用，但是由于某些原因它不起作用.

I am trying to get delegate methods to work with UITextView, but it's not working for some reason.

我在viewController.h中声明它是一个UITextViewDelegate

I have declared in my viewController.h that it is a UITextViewDelegate

当我点击textView时，我试图使以下代码起作用，以擦除默认代码"TEXT".

I am trying to get the following code to work to erase the default code "TEXT" when I tap on the textView.

- (void)textViewDidBeginEditing:(UITextView *)textView {

    if (myTextView.text == @"TEXT") {
        [myTextView setText:@""];
    }

    NSLog(@"did begin editing");
}

当我点击textView并出现键盘时，我希望清除文本并看到NSLog打印.什么都没发生

I expected to the text to be cleared and to see the NSLog print when I tap on the textView and the keyboard appears. Nothing at all happens

顺便使用文本视图是因为我需要根据其内容大小缩放视图，并且似乎textView具有contentSize属性，而whit标签和textField没有.

Using a text view by the way because I need to scale the view based on its content size and seems that the textView has a contentSize property, whit label and textField do not.

更新:

我应该使用过:

if ([myTextView.text isEqualToString:@"TEXT"]) {
    [myTextView setText:@""]; }

如果您想看一下，这里是项目.

推荐答案

您的 Test2ViewController.m 文件中缺少此方法:

this method is missing from your Test2ViewController.m file:

- (void)viewDidLoad {
    [myTextView setDelegate:self];
}

，或者，如果您更喜欢这种方式，也可以在 Interface Builder 中连接该委托.

or you can connect the delegate in the Interface Builder as well, if you prefer that way better.

更新#1:

将此方法添加到您的类中以控制return键.

add this method to you class for controlling the return key.

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if ([text isEqualToString:@"\n"]) {
        NSLog(@"Return pressed, do whatever you like here");
        return NO; // or true, whetever you's like
    }

    return YES;
}

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