利用TextFieldDelegate代理方法 – textField:shouldChangeCharactersInRange:replacementString: 限制输入字符

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

{

if (textField == _workIdTxt) {

NSUInteger lengthOfString = string.length;

for (NSInteger loopIndex = 0; loopIndex < lengthOfString; loopIndex++) {//只允许数字输入

unichar character = [string characterAtIndex:loopIndex];

if (character < 48) return NO; // 48 unichar for 0

if (character > 57) return NO; // 57 unichar for 9

}

// Check for total length

NSUInteger proposedNewLength = textField.text.length - range.length + string.length;

if (proposedNewLength > 10 || proposedNewLength<2) return NO;//限制长度

return YES;

}

return YES;

}

利用TextFieldDelegate代理方法 – textField:shouldChangeCharactersInRange:replacementString: 限制输入字符