如何在自动布局视图中使用UIBezierPath？ [英] How to use UIBezierPath in a auto layout view?

问题描述

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线时该怎么办？像 moveToPoint 这样的方法确实需要 CGRect 。

As far as I know, views displayed by constraints don't got a frame, so what should I do when I want to draw some lines in these views? Methods like moveToPoint do need a CGRect.

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）;
结果为 0.000000,0.000000,0.000000,0.000000

更多详细信息，这是我的代码：

For more details, here's my code:

-(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];
}

推荐答案

当然 UIView 即使使用自动版式也确实具有框架。您只是不需要手动设置值，AutoLayout会为您完成设置。仍会调用 setFrame：之类的方法。只需像往常一样实现 drawRect：。

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.

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