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最新推荐文章于 2022-03-27 15:30:32 发布

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本文介绍如何在iOS应用中利用Unicode字符实现自定义开关效果。通过在Interface Builder中添加Label对象并连接IBOutlet属性，结合触摸事件实现开关状态的切换。文中提供了具体的实现代码示例。

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    Add a new label object to Interface Builder.
    Create an IBOutlet property in Xcode and connect it up to it. In the code below I've called it 'fullyPaid' as I want to know if someone has fully paid a sum of money.
    Add the 2 functions below. The 'touchesBegan' function checks if you touched somewhere inside the 'fullyPaid' label object and if so, it calls the 'togglePaidStatus' function. The 'togglePaidStatus' function sets up two strings which have the unicode characters representing an empty box (\u2610) and a checked box (\u2611) respectively. Then it compares what's currently in the 'fullyPaid' object and toggles it with the other string.

You might want to call the togglePaidStatus function in the viewDidLoad function to set it to an empty string initially.

Obviously you can add extra checks to prevent users toggling the checkbox if the label is not enabled, but that's not shown below.

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];

    if (CGRectContainsPoint([fullyPaid frame], [touch locationInView:self.view]))
    {
        [self togglePaidStatus];
    }
}
-(void) togglePaidStatus
{
    NSString *untickedBoxStr = [[NSString alloc] initWithString:@"\u2610"];
    NSString *tickedBoxStr = [[NSString alloc] initWithString:@"\u2611"];

if ([fullyPaid.text isEqualToString:tickedBoxStr])
{
    fullyPaid.text = untickedBoxStr;
}
else
{
    fullyPaid.text = tickedBoxStr;
}

[tickedBoxStr release];
[untickedBoxStr release];

}