Note specifically that is why layoutSubviews: is called whenever a UIScrollView scrolls, as it performs the scrolling by changing its bounds' origin. Changing the frame will only change the bounds if the size has changed, as this is the only thing propagated to the bounds property.
Besides, A change in bounds of a view that is not yet in a view hierarchy will result in a call to layoutSubviews: when the view is eventually added to a view hierarchy. And just for completeness: these triggers do not directly call layoutSubviews, but rather call setNeedsLayout, which sets/raises a flag. Indeed, If it has no autoresize mask then layoutSubview will be called only when the view's (target View) frame size changes. Example: if you created UIView programmatically (it has no autoresize mask by default), LayoutSubview will be called only when UIView frame changes not on every addSubview. Subsequently, It has a custom subview at the bottom of the screen that correctly resizes in Interface Builder if I change the height of the nav bar. layoutSubviews is called when the view is created, but never again. My subviews are correctly laid out. Also Know, Its own bounds (not frame) changed. The bounds of one of its direct subviews changed. A subview is added to the view or removed from the view. The bounds are considered changed only if the new value is different, including a different origin.
20 Similar Question Found
When is layoutsubviews called in interface builder?
It has a custom subview at the bottom of the screen that correctly resizes in Interface Builder if I change the height of the nav bar. layoutSubviews is called when the view is created, but never again. My subviews are correctly laid out.
What causes layoutsubviews to be called on addsubview?
Some of the points in BadPirate's answer are only partially true: 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.
When to call layoutsubviews instead of layoutifneeded?
If you want to update the layout of your views immediately, call the layoutIfNeeded method.". This is right. The purpose of it is to consolidate all layout on a single call to layoutSubviews which is performed by the system at the appropriate time.
When do you call layoutsubviews on a view?
I found that layoutSubviews: will be called on a view if and only if: Its own bounds (not frame) changed. The bounds of one of its direct subviews changed. A subview is added to the view or removed from the view. The bounds are considered changed only if the new value is different, including a different origin.
What's the difference between layoutifneeded and layoutsubviews?
This behavior allows you to consolidate all of your layout updates to one update cycle, which is usually better for performance. In contrast, the method layoutIfNeeded is a synchronous call that tells the system you want a layout and redraw of a view and its subviews, and you want it done immediately without waiting for the update cycle.
When do you call layoutsubviews in javascript?
A change in bounds of a view that is not yet in a view hierarchy will result in a call to layoutSubviews: when the view is eventually added to a view hierarchy. And just for completeness: these triggers do not directly call layoutSubviews, but rather call setNeedsLayout, which sets/raises a flag.
When to not call layoutsubviews directly in photoshop?
If you look at the layoutSubviews documentation, it explicitly says this: You should not call this method directly. If you want to force a layout update, call the setNeedsLayout method instead to do so prior to the next drawing update. If you want to update the layout of your views immediately, call the layoutIfNeeded method. Copy link
Is it ok to not call layoutsubviews directly?
If you do not want to call layoutSubviews then you should copy the code out of the layoutsubviews and place it on another method. Then call the other method instead. Also in the layoutSubviews remove the existing code and call the same method as well. Would you clarify, why this would not be ok, but your approach would?
What's the book called that's that book called?
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What were protestants called in france called?
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Is there a show called a warrior called?
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