UITextFieldDelegate协议
发布日期:2021-05-09 04:03:54 浏览次数:19 分类:博客文章

本文共 2228 字,大约阅读时间需要 7 分钟。

 

很多人都认为UITextField很简单,为什么会写这个协议呢?

因为在实际开发中可能会用到;

 

比如要做到下图的效果:

文本框下面的下划线的颜色要随着输入的状态变化;

点击对应的文本框,其下面的线条变为绿色,结束编辑,变为灰色;

要熟悉UITextFieldDelegate协议才能做到这一点;

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,返回值是NO的时候,禁止输入; 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,返回值是YES时候,允许停止输入,并且释放第一响应;返回NO的时候,则相反;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,返回NO的时候,不保存修改 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按钮时候调用该方法,返回是NO的时候,不做任何响应;
 

 

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感谢大佬
[***.8.128.20]2025年04月15日 13时09分01秒