how can I call a method as I click UITextField?

Question

我想问一下如何在iphone UITextField中单击（触摸开始写入）来调用方法，就像我们单击UIButton并将方法放在“addTarget”中一样，对于UITextFields有什么办法吗？

Answer 1

implement a UITextFieldDelegate and do whatever you want to do in - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField or - (void)textFieldDidBeginEditing:(UITextField *)textField

You should use the first method if you want to stop the textfield from behaving like a textfield. For example if you want to open the textfield editor in a modal view. You can return NO there if you don't want this behavior.

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Edit: Here is the code to call myMethod:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { 
    [self myMethod]; 
    return YES; 
}

Answer 2

You can set textField's delegate and implement textFieldShouldBeginEditing: method in it - that method will get called when user taps the field and before it goes into editing.

See UITextFieldDelegate reference for more methods available.

Answer 3

[textField addTarget:self action:@selector(myMethod:) forControlEvents:UIControlEventEditingChanged];

-(void) myMethod:(id)sender
{
    UITextField* textField =  (UITextField *)sender;

}

i think this will help..!!

Answer 4

You can code as,

[YourTextField addTarget:self action:@selector(myMethod:) forControlEvents:UIControlEventEditingDidBegin];

-(void)myMethod
{
 [YourTextField resignFirstResponder];
 //Do whatever you want
}