UITextfield限制
输入键盘设置
placeHolderTF.keyboardType = UIKeyboardTypeASCIICapable;//设置键盘类型，不能输入中文
placeHolderTF.secureTextEntry = YES;//加密显示
placeHolderTF.returnKeyType = UIReturnKeyDone;//键盘return按钮设置
监听输入框编辑变化
[self.withdrawCashNumberTextFieild addTarget:self action:@selector(withdrawCashNumberTextFieildValueChanged:) forControlEvents:UIControlEventEditingChanged];
- (void)withdrawCashNumberTextFieildValueChanged:(UITextField *)textField{
//只能输入两位小数
NSString *text = textField.text;
NSRange pointRange = [text rangeOfString:@"."];
if (pointRange.location != NSNotFound) {
NSString *subtext = [text substringFromIndex:pointRange.location + pointRange.length - 1];
if (subtext.length > 2) {
textField.text = [text substringToIndex:pointRange.location + 3];
}
}
}
//限制小数输入
#pragma mark - UITextField处理
- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string
{
if(textField ==self.withdrawCashNumberTextFieild) {
//判断是否为删除字符，如果为删除则让执行
if(string.length==0) {
returnYES;
}
//获取输入框内字符串
NSString*text = textField.text;
//首位不能输.和0
if(text.length==0&& ([stringisEqualToString:@"."] || [stringisEqualToString:@"0"])) {
returnNO;
}
//判断是否有小数点
if([textrangeOfString:@"."].length) {
//不允许输双..
if([stringisEqualToString:@"."]){
returnNO;
}
//获取小数点后面字符串长度
if([textsubstringFromIndex:[textrangeOfString:@"."].location].length>2) {
returnNO;
}else{
returnYES;
}
}else{
returnYES;
}
}
returnYES;
}
限制文本长度
#pragma mark - UITextFieldDelegate
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
//用户名25字内
if (textField == self.userNameTF) {
NSInteger strLength = textField.text.length - range.length + string.length;
if (strLength < kNameLengthLimit+1) {
return YES;
}else{
textField.text = [textField.text substringToIndex:kNameLengthLimit];
return NO;
}
}else if (textField == self.telNumberTF) {
//手机号码文本框限制只能输入11个数字
NSInteger strLength = textField.text.length - range.length + string.length;
return (strLength <= 11);
}
键盘return按钮点击响应textField代理事件
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
//此判断是为围堵姓名／邀请码等有中文的输入字数超限
if (textField.keyboardType == UIKeyboardTypeDefault) {
if (textField == self.userNameTF && textField.text.length > kNameLengthLimit) {
textField.text = [textField.text substringToIndex:kNameLengthLimit];
}
}
[textField resignFirstResponder];
return YES;
}
