UITextFieldDelegate协议 – 鸿鹄当高远

 

很多人都认为UITextField很简单,为什么会写这个协议呢?

开发中可能会用到;

 

比如:

文本框下面的下划线的颜色要随着输入的状态变化;

所以,要熟悉UITextFieldDelegate协议

首先,先看一下官方的说明:

– (BOOL)textFieldShouldBeginEditing:(UITextField *)textField; // return NO to disallow editing.
– (void)textFieldDidBeginEditing:(UITextField *)textField; // became first responder
– (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
– (void)textFieldDidEndEditing:(UITextField *)textField; // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called

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

– (BOOL)textFieldShouldClear:(UITextField *)textField; // called when clear button pressed. return NO to ignore (no notifications)
– (BOOL)textFieldShouldReturn:(UITextField *)textField; // called when ‘return’ key pressed. return NO to ignore.

 

1、

– (void)textFieldDidBeginEditing:(UITextField *)textField;

文本框已经开始编辑

2、

– (void)textFieldDidEndEditing:(UITextField *)textField;

文本框已经结束编辑

 

3、其他设置是否允许的输入控制

1、- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField; // return NO to disallow editing.
//控制是否允许输入

2、- (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
//是否结束输入

3、- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string; // return NO to not change text
//是否改变输入文本
4、- (BOOL)textFieldShouldClear:(UITextField *)textField; // called when clear button pressed. return NO to ignore (no notifications)
//当清空按钮时候调用,返回是NO的时候,忽视清空

5、- (BOOL)textFieldShouldReturn:(UITextField *)textField; // called when ‘return’ key pressed. return NO to ignore.
//当点击return按钮时候调用,返回是NO的时候,不做任何响应

 

本文链接:UITextFieldDelegate协议,转载请注明。



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