添加复选标记到UIActionSheet按钮类似于Airplay动作表

Question

我想弄清楚如何在UIActionSheet的按钮右侧添加复选标记。

我想模仿AirPlay动作表中的复选标记。据我所知，定制这些按钮意味着要访问苹果的私有API，这将使你面临被App Store拒绝的风险。

是否有一种安全的方法来添加这个复选标记?

Answer 1

这个方法怎么样?

在按钮内放置一个带有"tick"的标签并切换它。下面的代码就是这样做的。切换是通过KVO完成的，但可以用更简单的方式完成…

按钮通过self.theButton在IB连接

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Create a 'tick' label
    CGRect rect;
    rect.size = CGSizeMake(17, 21);
    rect.origin.x = self.theButton.frame.size.width-17-10;
    rect.origin.y = (self.theButton.frame.size.height-21)/2;
    UILabel *label = [[UILabel alloc] initWithFrame:rect];
    label.text = [NSString stringWithCString:"342234223" encoding:NSUTF8StringEncoding];
    label.backgroundColor = [UIColor clearColor];
    label.hidden = YES;
    // Put label inside the button
    [self.theButton addSubview:label];
    // Connect a observer on 'highlighted' (eq pressed basically)
    // could use another method to track 'selected'
    [self.theButton addObserver:self
                     forKeyPath:@"highlighted"
                        options:0
                        context:(__bridge void*)label];
}
// Toggle the 'tick' label
- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(UIButton*)button
                        change:(NSDictionary *)change
                       context:(UILabel *)label
{
    if (button.highlighted)
        label.hidden = !label.hidden;
}
// Don't forget to cleanup
- (void)dealloc
{
    [self.theButton removeObserver:self forKeyPath:@"highlighted"];
}

Answer 2

    NSString* strUrl=[MLControl shared].currentServerUrl;
    for( MLServerUrl *title in [MLControl shared].arrServerUrl)  {
        NSString* strShow=title.name;
        if ([strUrl isEqualToString: title.url]) {
            strShow=[NSString stringWithFormat:@"√ %@",strShow];
        }else{
            strShow=[NSString stringWithFormat:@"  %@",strShow];
        }
        [chooseImageSheet addButtonWithTitle:strShow];
    }
   // [[[chooseImageSheet valueForKey:@"_buttons"] objectAtIndex:0] setImage:[UIImage imageNamed:@"ic_check_black_18dp.png"] forState:UIControlStateNormal];
    chooseImageSheet.actionSheetStyle = UIActionSheetStyleDefault;
    [chooseImageSheet showFromRect:btnRc inView:sender animated:YES];