限制文本框只能输入数字
textField.delegate = self;
#pragma mark - UITextField Delegate
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
return [self validateNumber:string];
}
- (BOOL)validateNumber:(NSString *)number {
BOOL res = YES;
NSCharacterSet *tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
NSInteger i = 0;
while (i < number.length) {
NSString *string = [number substringWithRange:NSMakeRange(i, 1)];
NSRange range = [string rangeOfCharacterFromSet:tmpSet];
if (range.length == 0) {
res = NO;
break;
}
i++;
}
return res;
}
