iOS：textfield切换显隐时发生的问题

问题1:切换显隐时，光标会错位的问题

解决办法1:

NSString*string =self.passwordTextField.text;//切换内容后可以从新定位光标位置

self.passwordTextField.text=@"";

self.passwordTextField.text= string;

解决办法2:

textField.enabled =NO;//切换内容后可以从新定位光标位置效果同上

textField.secureTextEntry =YES;

textField.enabled =YES;

[textFieldbecomeFirstResponder];

问题2:切换显隐时，继续输入会将之前的内容清空

解决办法:

#pragma mark ---textField代理方法---

//为textfield从新赋值没有此代理方法则切换显隐后内容会被清空

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

{

if([stringisEqualToString:@" "]) { //不能输入空格

returnNO;

}

//如果是删除键并且内容长度大于0

if([stringisEqualToString:@""] &&self.passwordTextField.text.length>0) {

NSString*stringtemp = [self.passwordTextField.textsubstringToIndex:self.passwordTextField.text.length-1];

self.passwordTextField.text= stringtemp;

returnNO;

}

NSString*stringTemp = [NSStringstringWithFormat:@"%@%@",textField.text,string];

self.passwordTextField.text= stringTemp;

return NO;

}