Web10 jul. 2015 · I'm still trying to figure this out myself, so take this with some skepticism and forgive me if it contains errors. setNeedsLayout is an easy one: it just sets a flag somewhere in the UIView that marks it as needing layout. That will force layoutSubviews to be called on the view before the next redraw happens. Note that in many cases you don't need to … Web27 jul. 2015 · layoutSubviews作用 . layoutSubviews是对subviews重新布局。比如,我们想更新子视图的位置的时候,可以通过调用layoutSubviews方法,既可以实现对子视图 …
iOS layoutSubviews调用时机 - 掘金
Web7 apr. 2009 · layoutSubviews is called when the view is created, but never again. My subviews are correctly laid out. If I toggle the in-call status bar off, the subview's … Web8 apr. 2009 · addSubview causes layoutSubviews to be called on the view being added, the view it's being added to (target view), and all the subviews of the target. It depends on the view's (target view) autoresize mask. If it has autoresize mask ON, layoutSubview will be called on each addSubview . how many baptisms are in the bible
iOS开发笔记--什么时候调用layoutSubviews - 简书
Web14 mei 2024 · 在iOS的UI层,有大量的layout开头的方法,在这里总结一下。 1.layoutSubViews这个方法,默认没有做任何事情,需要子类进行重写,常用在自定义视图里,比如自定义一个view。那么在什么时候调用呢? addSubview会触发layoutSubviews (这是前提,最起码要保证视图被添加出来,下面的都在这个前提下) 设置 ... Web24 jun. 2024 · 1、如果在UIView初始化时没有设置rect大小,将直接导致drawRect不被自动调用。. drawRect调用是在Controller->loadView, Controller->viewDidLoad 两方法之后掉用的.所以不用担心在控制器中,这些View的drawRect就开始画了.这样可以在控制器中设置一些值给View (如果这些View draw的时候 ... how many baptisms are there in the bible