iOS TextField禁止输入空格

方法一：TextField的代理方法

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSString *tempStr = [[string componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]componentsJoinedByString:@""];
    
    if (![string isEqualToString:tempStr]) {
        return NO;
    }

    return YES;
}

方法二：TextField添加点击方法，类似于Button的addTarget方法。

[self.textField addTarget:self action:@selector(textFieldChange:) forControlEvents:UIControlEventEditingChanged];

// 自定义的方法，替换空的字符串
- (void)textFieldChange:(UITextField *)textField {
    textField.text =[textField.text stringByReplacingOccurrencesOfString:@" " withString:@""];
 }