在 UITextView 之上添加 UILabel 作为子视图

Question

I am trying to make a fake placeholder for a UITextView with a UILabel . Let's say there's a UITextView inside ViewController and this is what I do:

    CGFloat frameWidth = self.postInputField.frame.size.width;
    textViewPlaceholder = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, frameWidth, 200)];
    textViewPlaceholder.text = POST_PLACEHOLDER;
    textViewPlaceholder.textColor = [UIColor lightGrayColor];
    [self.view addSubview:textViewPlaceholder];

    [super viewWillAppear:animated];
}

And there's an unnecessary margin on top of the UILabel as shown below:

I could set the y value to be negative something but I want to make sure why this is happening. One thing that I do when the view controller is loaded is self.automaticallyAdjustsScrollViewInsets = NO; to get rid of the margin inside the UITextView , but it shouldn't matter.

The exact xy values that work are (4, -16) for the UILabel.

Answer 1

I think the problem is the height of UILabel :

textViewPlaceholder = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, frameWidth, 200)];

The height is too large. Try to reduce it. And using background color to see more.