XIB view has larger bound values and doesn't fit the screen - ios

Question

I have a XIB view.
When i added it to my view, i want the width and height to fit the iOS device.
However, it doesn't fit.
If i use autolayout it would fit the screen. But how do i use it ?
In the code example below, it takes the Bounds of the XIB file. Therefore it doesn't fit the view. How can i solve this?
-(id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
self.myView=[[[NSBundle mainBundle] loadNibNamed:#"MyView" owner:self options:nil] lastObject];
self.bounds=self.myView.bounds;
[self addSubview:self.myView];
}
return self;
}

Answer 1

Load your view, then
[_subview setTranslatesAutoresizingMaskIntoConstraints:NO];
[_contentView addSubview:_subview];
[self activateConstraintsForView:_subview respectToParentView:_contentView];
Use this function :
- (void)activateConstraintsForView:(UIView *)view respectToParentView:(UIView *)parentView
{
NSLayoutConstraint *bottomConstraint = [NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual
toItem:parentView
attribute:NSLayoutAttributeBottom
multiplier:1.0
constant:0];
NSLayoutConstraint *topConstraint = [NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:parentView
attribute:NSLayoutAttributeTop
multiplier:1.0
constant:0];
NSLayoutConstraint *leftConstraint = [NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:parentView
attribute:NSLayoutAttributeLeft
multiplier:1.0
constant:0];
NSLayoutConstraint *rightConstraint = [NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual
toItem:parentView
attribute:NSLayoutAttributeRight
multiplier:1.0
constant:0];
[NSLayoutConstraint activateConstraints:[NSArray arrayWithObjects:topConstraint, leftConstraint, bottomConstraint, rightConstraint, nil]] ;
}
Hope, it helps.

Answer 2

In your initWithFrame method add this at the end:
[self setConstraintsOfView:self.myView withRespectToParentView:self];
And add the method below at the end of your class:
-(void)setConstraintsOfView:(UIView *)subView withRespectToParentView:(UIView *)parentView
{
NSDictionary *viewsDictionary = #{#"subView":subView};
NSDictionary *metrics =#{#"offset":#0};
NSArray *heightConstraint = [NSLayoutConstraint constraintsWithVisualFormat:#"V:|-offset-[subView]-offset-|"
options:0
metrics:metrics
views:viewsDictionary];
NSArray *widthConstraint = [NSLayoutConstraint constraintsWithVisualFormat:#"H:|-offset-[subView]-offset-|"
options:0
metrics:metrics
views:viewsDictionary];
[parentView addConstraints:heightConstraint];
[parentView addConstraints:widthConstraint];
}
VFL is much easier than setting each constraints. This method sets the top, bottom, leading and trailing space = 0 of subview with respect to superview.
I think you want to achieve this though:
https://github.com/PrajeetShrestha/ConstraintTest