自定义UIButton不会显示

I'm making a game and everything's working fine. But there seems to be a problem with this custom button I made:

我正在制作游戏,一切正常。但是我的这个自定义按钮似乎有问题:

let button = UIButton(type: UIButtonType.Custom) as UIButton
let image = UIImage(named: "bluePlayButton")
button.setImage(image, forState: UIControlState.Normal)
button.frame = CGRectMake(self.size.width/2, self.size.height * 0.15, 300, 200)
button.layer.zPosition = 1

self.view?.addSubview(button)

When I run the application, the button just doesn't appear. What's wrong with my code, is there something missing?

当我运行应用程序时,按钮就不会出现。我的代码出了什么问题,有什么遗漏?

1 个解决方案

#1

I am currently integrating UI elements inside a sprite-kit scene, and i have to say that is a bit tricky. If you could give me more information about the other elements of the class, if is it a UIView or a SKScene (SKView), or a SKNode. When mixing both approaches this really is a pain.

我目前正在sprite-kit场景中集成UI元素,我不得不说这有点棘手。如果您可以提供有关该类其他元素的更多信息,如果它是UIView或SKScene(SKView),还是SKNode。当混合两种方法时,这真的很痛苦。

But with the information you gave I can tell you that I have the same problem and I solved changing the method where a I added the UI elements on the SKScene. Before it was on the viewDidLoad but I should do it on the viewDidAppear.

但是根据您提供的信息,我可以告诉您我遇到了同样的问题,并且我解决了更改我在SKScene上添加UI元素的方法的问题。之前它在viewDidLoad上,但我应该在viewDidAppear上进行。

EXAMPLE (Objective-C):

The iCarousel is a UI element (not SKView or SKNode).

iCarousel是一个UI元素(不是SKView或SKNode)。

-(void)didMoveToView:(SKView *)view {
//Your code but in Objective-C
UIButton * button  = UIButton
UIButton * button  = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage * image = [UIImage imageNamed:@"bluePlayButton"];
[button setImage:image forState:UIControlStateNormal];
[button setFrame:CGRectMake(self.size.width/2, self.size.height * 0.15, 300, 200)];
button.layer.zPosition=1;
[self.view addSubView:button];
}

Also, double check the zPosition of the button and the other elements.

另外,仔细检查按钮的zPosition和其他元素。
Make really sure that the image is being loaded properly with the debugger. Even with the extension (.png) something might be happening to prevent so. ( as suggested by @matt on the comments)

确保使用调试器正确加载图像。即使使用扩展名(.png),也可能会发生一些事情以防止这种情况发生。 (正如@matt对评论的建议)
I STRONGLY recommend to avoid mixing UIKit elements with Sprite-Kit elements.

我强烈建议避免将UIKit元素与Sprite-Kit元素混合使用。
Please give some more information if this does not solve your problem ;)

如果这不能解决您的问题,请提供更多信息;)

EDIT: Another example of how to do the the corresponding to UIButton in Sprite-Kit ( the most simple way).

编辑:如何在Sprite-Kit中执行与UIButton相对应的另一个示例(最简单的方法)。

(Just taken from this question - Setting up buttons in SKScene )

(刚从这个问题中解脱出来 - 在SKScene中设置按钮)

You could use a SKSpriteNode as your button, and then when the user touches, check if that was the node touched. Use the SKSpriteNode's name property to identify the node:

您可以使用SKSpriteNode作为按钮,然后当用户触摸时,检查是否触摸了节点。使用SKSpriteNode的name属性来标识节点:

//fire button
- (SKSpriteNode *)fireButtonNode
{
    SKSpriteNode *fireNode = [SKSpriteNode spriteNodeWithImageNamed:@"fireButton.png"];
    fireNode.position = CGPointMake(fireButtonX,fireButtonY);
    fireNode.name = @"fireButtonNode";//how the node is identified later
    fireNode.zPosition = 1.0;
    return fireNode;
}

Add node to your scene:

将节点添加到场景中:

[self addChild: [self fireButtonNode]];

Handle touches:

//handle touch events
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];

    //if fire button touched, bring the rain
    if ([node.name isEqualToString:@"fireButtonNode"]) {
         //do whatever...
    }
}

#1