iOS8 UIView width 320 - ios

Question

There is the question: I set a custom view named ZHLockView. I put it in the storyboard and I set the constraints. But I can't get the correct width in - (id)initWithCoder:(NSCoder *)aDecoder, it is always 320, what should I do to get the correct width?
Last I know in the - (void)layoutSubviews, I can get the right width, but it will going twice. Is there a better idea?

Answer 1

See, you're getting width 320 because your view is of that size on storyboard.
If the width of the view is equal to superview, which is indeed again equal to width of device, you can use following code to get width of view at anytime and dont need to worry about where to write.
Swift :-
CGFloat width = CGRectGetWidth(UIScreen.mainScreen.bounds);
CGFloat height = CGRectGetHeight(UIScreen.mainScreen.bounds);
Objective-C :-
CGFloat width = CGRectGetWidth([[UIScreen mainScreen] bounds]);
CGFloat height = CGRectGetHeight([[UIScreen mainScreen] bounds]);
Hope you understood and it helps you.. :)

Answer 2

the code is here
objc
#define KScreenWidth [UIScreen mainScreen].bounds.size.width
CGFloat height = 0;
CGFloat margin = (KScreenWidth - columnCount * btnW) / (columnCount + 1);
for (int i = 0; i < btnCount; i++) {
int row = i / columnCount;
int column = i % columnCount;
CGFloat btnX = margin + column * (btnW + margin);
CGFloat btnY = row * (btnW + margin);
height = btnH + btnY;
ZHButtonView *button = [[ZHButtonView alloc] initWithFrame:CGRectMake(btnX, btnY, btnW, btnH)];
button.userInteractionEnabled = NO;
button.currentIndex = i;
[button setBackgroundImage:[UIImage imageNamed:#"gesture_node_normal"] forState:UIControlStateNormal];
[button setBackgroundImage:[UIImage imageNamed:#"gesture_node_highlighted"] forState:UIControlStateSelected];
[self addSubview:button];
}

Answer 3

The view will be load with the value in the xib at the first start, next when the autolayout engine makes the first pass, it will be set to a new value according to the constraints set.
Why would you need to know the size? Autolayout is made to do not care about it.
-layoutSubviews, -viewWillLayout, -viewDidLayout are called when the layout engine needs a update, that could means Different times before displaying your view.