ios - removeFromSuperView 不适用于按钮

Question

另一个让我头疼的问题。我以编程方式创建了一个 UIButton。它的唯一目的是站在另一个已按下半秒钟的按钮之上。底部按钮是图片，顶部按钮是垃圾桶。您可以在这里看到我正在尝试做的事情:我有一张图片，要删除它，您必须将其推送一段时间。

if (CGRectContainsPoint(self.capturedImageOneSmall.frame, tapAndHoldPoint)) {

                aboutToDeleteImageTrashCan = [[UIButton alloc] init];
                aboutToDeleteImageTrashCan.frame = self.capturedImageOneSmall.frame;
                [aboutToDeleteImageTrashCan setBackgroundImage:[UIImage imageNamed:@"LogoTrashcan"] forState:UIControlStateNormal];
                [aboutToDeleteImageTrashCan addTarget:self action:@selector(deleteImage:) forControlEvents:UIControlEventTouchUpInside];
                aboutToDeleteImageTrashCan.tag = 1;
                [self.scrollView addSubview:aboutToDeleteImageTrashCan];

当我调用我的方法来删除两个按钮时，只有图片消失了，垃圾桶保留下来，甚至仍然可以点击。

- (void)deleteImage:(UIButton *)sender
{
    if (aboutToDeleteImageTrashCan.tag == 1) {
        [self.capturedImageOneSmall removeFromSuperview]; //this works!
        self.capturedImageOneSmall = nil;
        capturedImageOneData = nil;
    }
    [aboutToDeleteImageTrashCan performSelectorOnMainThread:@selector(removeFromSuperview) withObject:nil waitUntilDone:NO]; //this doesn't!
    aboutToDeleteImageTrashCan = nil;

你们有什么想法吗？

Answer 1

当你把它放在包含“performSelectorOnMainThread”调用的行之前时，你能显示这个语句的输出吗:

NSLog(aboutToDeleteImageTrashCan: %@, aboutToDeleteImageTrashCan);