ios - 如何在iOS中创建复选框？

Question

我采用了两个自定义按钮和一种方法来设置它们的选中和取消选中

在 viewdidload() 中我是这样写的..

[checkbox_01 setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
[checkbox_02 setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
isChecked_01 = NO; //declared as boolean to change check and uncheck for button one
isChecked_02 = NO; //declared as boolean to change check and uncheck for button two

在方法中

-(IBAction)checkboxOnClick:(UIButton *)sender {
    if (sender.tag == 1) {
        if (isChecked_01 == NO) {
            [checkbox_01 setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateNormal];
            isChecked_01 = YES;
        }
        else
        {
            [checkbox_01 setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
            isChecked_01 = NO;
        }
    }

    if (sender.tag == 2) {
        if (isChecked_02 == NO) {
            [checkbox_02 setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateNormal];
            isChecked_02 = YES;
        }
        else
        {
            [checkbox_02 setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
            isChecked_02 = NO;
        }
    }
}

还有其他方法可以在 ios 中创建复选框吗？我已经为每个复选框添加了一个 isChecked bool 值。是否有可能在整个检查列表中仅使用一个 bool 值......

Answer 1

您可以使用selected属性(继承自 UIControl)而不是 isChecked_01 和 isChecked_02:

[checkbox_01 setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
[checkbox_02 setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];

[checkbox_01 setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateSelected];
[checkbox_02 setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateSelected];

- (IBAction)checkboxOnClick:(UIButton *)sender {
    sender.selected = !sender.selected;
}