将 cgpoint 又名击中 cgpoint 发送到不兼容类型 UIOffset 又名击中 UIOffset 的参数答案

【问题标题】：sending cgpoint aka struck cgpoint to parameter of incompatible type UIOffset aka struck UIOffset将 cgpoint 又名击中 cgpoint 发送到不兼容类型 UIOffset 又名击中 UIOffset 的参数
【发布时间】：2013-09-26 04:25:31
【问题描述】：

我下载了苹果“DynamicsCatalog.xcodeproj”的示例代码，我遇到了这个问题

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIDynamicAnimator* animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
    UICollisionBehavior* collisionBehavior = [[UICollisionBehavior alloc] initWithItems:@[self.square1]];

    CGPoint squareCenterPoint = CGPointMake(self.square1.center.x, self.square1.center.y - 100.0);
    CGPoint attachmentPoint = CGPointMake(-25.0, -25.0);
    /*
     By default, an attachment behavior uses the center of a view. By using a small offset, we get a more interesting effect which will cause the view to have rotation movement when dragging the attachment.
     */
    UIAttachmentBehavior *attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self.square1 point:attachmentPoint attachedToAnchor:squareCenterPoint];

    collisionBehavior.translatesReferenceBoundsIntoBoundary = YES;

    // Show visually the attachment points
    self.redSquare.center = attachmentBehavior.anchorPoint;
    self.blueSquare.center = CGPointMake(25.0, 25.0);

    [animator addBehavior:attachmentBehavior];
    self.animator = animator;

    self.attachmentBehavior = attachmentBehavior;
}

我在哪里替换这一行：

UIAttachmentBehavior *attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self.square1 attachedToAnchor:squareCenterPoint];

用这一行：

 UIAttachmentBehavior *attacheMentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self.square1 offsetFromCenter:attachmentPoint attachedToAnchor:squareCenterPoint];

但我收到此错误：

将 cgpoint 又名打击 cgpoint 发送到不兼容类型 UIOffset 又名打击 UIOffset 的参数

如果您能告诉我我做错了什么或如何解决此问题，我将不胜感激。

谢谢

【问题讨论】：

标签： iphone ios ipad xcode5

【解决方案1】：

这是因为您传递的 attachmentPoint 是 CGPoint 类型。您必须创建一个 UIOffset 类型的变量并传递该变量而不是您的 attachmentPoint。

【讨论】：

我很困惑。你能告诉我怎么做吗？

【解决方案2】：

这样做 -

   UIOffset attachmentPoint = UIOffsetMake (-25.0, -25.0);

  UIAttachmentBehavior *attachmentBehavior = [[UIAttachmentBehavior alloc]
                                                initWithItem:self.square1
                                                offsetFromCenter:attachmentPoint
                                                attachedToAnchor:squareCenterPoint];

希望这会有所帮助！

【讨论】：