UITextField代理详解

第一继承自UIControl

添加事件

[textFieldaddTarget:selfaction:@selector(didDone:)forControlEvents:UIControlEventEditingDidEndOnExit];

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField; // return NO to disallow editing.

返回值是true或false

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField

{

NSLog(@"textFieldShouldBeginEditing");

return YES;

}

- (void)textFieldDidBeginEdiUITextField *)textField; // became first responder

此时已变成第一响应者

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField

{

NSLog(@"textFieldDidBeginEditing");

return YES;

}

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField; // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end

编辑完之后，键盘放弃第一响应者

- (void)textFieldDidEndEditing:(UITextField *)textField; // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called

输入结束之后调用

- (void)textFieldDidEndEditing:(UITextField *)textField

{

NSLog(@"textFieldDidEndEditing");

}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string; // return NO to not change text

通过每次输入的内容，返回YES，则会在textField做显示，否则不显示

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

NSLog(@"the input char is %@",string);

return YES;

}

- (BOOL)textFieldShouldClear:(UITextField *)textField; // called when clear button pressed. return NO to ignore (no notifications)

如果返回值是NO ,则点击clear不会清除

- (BOOL)textFieldShouldClear:(UITextField *)textField

{

NSLog(@"textFieldShouldClear");

return NO;

}

- (BOOL)textFieldShouldReturn:(UITextField *)textField; // called when 'return' key pressed. return NO to ignore

点击return 钮之后，是否仍然显示

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{// called when 'return' key pressed. return NO to ignore.

return NO;

}