输入控制：
/**
* textFiled输入变化的时候
*
* @param textField
replacementString //键盘每次输入的键
*/
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
//控制输入个数
if (textField.tag == numberTextFieldTag) {
//判断是否为删除字符，如果为删除则让执行
if (string.length == 0) {
return YES;
}
//获取输入框内字符串
NSString *text = textField.text;
//判断是否有小数点
if ([text rangeOfString:@"."].length) {
//获取小数点后面字符串长度
if ([text substringFromIndex:[text rangeOfString:@"."].location].length > 2) {
return NO;
}else{
return YES;
}
}else{
return YES;
}
}
return YES;
}
提交时：
NSString *text = self.redPacketNumberTextField.text;
//判断输入是否合规
//如果存在"."
if ([text rangeOfString:@"."].location != NSNotFound) {
if ([text hasPrefix:@"."] || [text hasSuffix:@"."]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:AppLocalizedString(@"Red Packet Amount error") delegate:self cancelButtonTitle:AppLocalizedString(@"OK") otherButtonTitles:nil, nil];
[alert show];
[self.redPacketNumberTextField becomeFirstResponder];
return;
}else{
//如果出现多个"."
NSString *str = [text substringFromIndex:[text rangeOfString:@"."].location + 1];
if ([str rangeOfString:@"."].location != NSNotFound) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:AppLocalizedString(@"Red Packet Amount error") delegate:self cancelButtonTitle:AppLocalizedString(@"OK") otherButtonTitles:nil, nil];
[alert show];
[self.redPacketNumberTextField becomeFirstResponder];
return;
}
//如果0开头，且小数点前面不止一位
if ([text hasPrefix:@"0"]){
NSString *perfixStr = [text substringWithRange:NSMakeRange(1, 1)];
if (![perfixStr isEqualToString:@"."]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:AppLocalizedString(@"Red Packet Amount error") delegate:self cancelButtonTitle:AppLocalizedString(@"OK") otherButtonTitles:nil, nil];
[alert show];
[self.redPacketNumberTextField becomeFirstResponder];
return;
}
}
}
}else{
//如果没有小数点
//如果0开头
if ([text hasPrefix:@"0"]){
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:AppLocalizedString(@"Red Packet Amount error") delegate:self cancelButtonTitle:AppLocalizedString(@"OK") otherButtonTitles:nil, nil];
[alert show];
[self.redPacketNumberTextField becomeFirstResponder];
return;
}
}
