如何将文本编程到文本字段中？

Question

I am using Xcode 6.3 with Objective-C language. The app that I am building has UITextField and UITextView . I am wanting to have text show up in the fields/views so that the user will have instructions on what to put into the fields/views. Example, "enter your name". How can I do this?

Answer 1

UITextField:

For your UITextField you should define the placeholder for the instructions text.

_textField.placeholder= @"Your Name";

UITextView :

UITextView does not have a default placeholder like UITextField. But you can make the effect like placeholder by following these steps.

- (void)viewDidLoad {
    [super viewDidLoad];

    _textView.text = @"Enter Comment...";
    _textView.textColor = [UIColor lightGrayColor];
    _textView.delegate = self;
}

- (void)textViewDidBeginEditing:(UITextView *)textView
{
    if ([textView.text isEqualToString:@"Enter Comment..."]) {
        textView.text = @"";
        textView.textColor = [UIColor blackColor];
    }
    [textView becomeFirstResponder];
}

- (void)textViewDidEndEditing:(UITextView *)textView
{
    if ([textView.text isEqualToString:@""]) {
        textView.text = @"Enter Comment...";
        textView.textColor = [UIColor lightGrayColor];
    }
    [textView resignFirstResponder];
}

Answer 2

You may be looking for the placeholder property.

let t = UITextField()
t.placeholder = "enter your name"

Answer 3

文本字段的占位符是显示一些文本的方式...

textField.placeholder  = "Enter your name"

Answer 4

if you wann change the text just call:

textfield.text = @"enter your name"

if you just want to set a placeholder which will disappear on user input use this property :

textfield.placeholder = @"enter your name"

Answer 5

if you want a list instructions , please add /place a UIView in appropriate location and show and hide inside your textFieldDidBeginEditing: delegate method.

Note :- place holders might not be appropriate as it has limit to text and your instructions may be huge.