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据我所知，约束显示的视图没有框架，那么当我想在这些视图中画一些线时该怎么办？像这样的方法moveToPoint确实需要一个CGRect.

这是我的支票：NSLog(@"%f,%f,%f,%f",self.contentView.frame.origin.x,self.contentView.frame.origin.y,self.contentView.frame.size.width,self.contentView.frame.size.height); 结果是0.000000,0.000000,0.000000,0.000000

有关更多详细信息，这是我的代码：

-(void)loadView
{
    self.view = [[UIView alloc]init];


    self.titleView = [[UIView alloc]init];
    self.placesHolder = [[UIView alloc]init];
    self.contentView = [[UIView alloc]init];

    self.titleView.translatesAutoresizingMaskIntoConstraints = NO;
    self.placesHolder.translatesAutoresizingMaskIntoConstraints = NO;
    self.contentView.translatesAutoresizingMaskIntoConstraints = NO;

    self.titleView.backgroundColor = [UIColor grayColor];
    self.placesHolder.backgroundColor = [UIColor blueColor];
    self.contentView.backgroundColor = [UIColor redColor];

    [self.view addSubview:self.titleView];
    [self.view addSubview:self.placesHolder];
    [self.view addSubview:self.contentView];

    NSDictionary *timeLineViewMap = @{@"titleView":self.titleView,
                                  @"placesHolder":self.placesHolder,
                                  @"contentView":self.contentView
                                  };


    NSArray *titleHorizon = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[titleView]|" options:0 metrics:nil views:timeLineViewMap];
    NSArray *placesHolderHorizon = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[placesHolder(==58)]-0-[contentView]|" options:0 metrics:nil views:timeLineViewMap];
    NSArray *titleVertical = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[titleView(==58)]-0-[placesHolder]|" options:0 metrics:nil views:timeLineViewMap];
    NSArray *contentViewConstrain = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[titleView]-0-[contentView]|" options:0 metrics:nil views:timeLineViewMap];


    [self.view addConstraints:titleHorizon];
    [self.view addConstraints:placesHolderHorizon];
    [self.view addConstraints:titleVertical];
    [self.view addConstraints:contentViewConstrain];
}
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2 回答 2

2

Of course UIView does have a frame even with AutoLayout. You just don't set the values manually, AutoLayout is doing that for you. Methods like setFrame: are still called. Simply implement drawRect: like you always did.

于 2014-12-12T12:30:37.347 回答
1

好吧，问题解决了，似乎视图的框架在viewDidAppear移动之前不会得到大小。然后我检查了一些其他问题，例如iOS AutoLayout - get frame size width，这表明addConstraints应该放在viewDidLayoutSubviews方法中，而不是在 viewController 生命周期中。

于 2014-12-13T01:53:43.727 回答