CODEWITHSUNDEEP
iosobjective-cautolayoutnslayoutconstraint
Nishi Bansal
Nishi Bansal

Reputation: 315

UIView not displayed with translateAutoResizingMaskIntoConstraints set to NO

I want to increase the height of mainview dynamically as the content size of scrollview increases. As you see in my image, there is white space left in scrollview and I want that to be covered by my main view. I don't know initially what will be the content size of scrollview as it is increasing at runtime.

Here is my following code:

int x= 17;
int y = 27;
int width = 287;
int height = 181;
int mainview_height = 568;
int x_spacer = 0;
int y_spacer = 0;
int width_spacer = 320;
int height_spacer = 27;
UIView *view_spacer = [[UIView alloc]init];
[view_spacer setBackgroundColor:[UIColor greenColor]];
view_spacer.translatesAutoresizingMaskIntoConstraints = false;
[self.mainView addSubview:view_spacer];
 UIView *view1 = [[UIView alloc]init];
 [view1 setBackgroundColor:[UIColor whiteColor]];
 view1.translatesAutoresizingMaskIntoConstraints = false;
 [self.mainView addSubview:view1];
[view_spacer addConstraint:[NSLayoutConstraint constraintWithItem:view_spacer attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:view_spacer attribute:NSLayoutAttributeHeight multiplier:width_spacer/height_spacer constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view_spacer attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeTop multiplier:1 constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view_spacer attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeHeight multiplier:width_spacer/mainview_height constant:0.0f]];  
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view.spacer attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:view_spacer attribute:NSLayoutAttributeBottom multiplier:1 constant:0.0f]];
[view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeHeight multiplier:width/height constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeHeight multiplier:width/mainview_height constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];

My view1 and view_spacer are not getting displayed. What is wrong in my code?I want to increase the height of mainview dynamically as the content size of scrollview increases. As you see in my image, there is white space left in scrollview and I want that to be covered by my main view. I don't know initially what will be the content size of scrollview as it is increasing at runtime.

Upvotes: 0

Views: 231

Answers (1)

Mahesh Agrawal
Mahesh Agrawal

Reputation: 3358

Here is your solution. I have tried this code in a test project. Its working fine just needs a slight change. Paste below code instead of your code and check it. I have changed the second view color to red to identify better.

float x= 17;
float y = 27;
float width = 287;
float height = 181;
float mainview_height = 568;
float x_spacer = 0;
float y_spacer = 0;
float width_spacer = 320;
float height_spacer = 27;

UIView *view_spacer = [[UIView alloc]init];
[view_spacer setBackgroundColor:[UIColor greenColor]];
view_spacer.translatesAutoresizingMaskIntoConstraints = false;
[self.mainView addSubview:view_spacer];
UIView *view1 = [[UIView alloc]init];
[view1 setBackgroundColor:[UIColor redColor]];
view1.translatesAutoresizingMaskIntoConstraints = false;
[self.mainView addSubview:view1];

[view_spacer addConstraint:[NSLayoutConstraint constraintWithItem:view_spacer attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:view_spacer attribute:NSLayoutAttributeHeight multiplier:width_spacer/height_spacer constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view_spacer attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeTop multiplier:1 constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view_spacer attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeHeight multiplier:width_spacer/mainview_height constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view_spacer attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:view_spacer attribute:NSLayoutAttributeBottom multiplier:1 constant:0.0f]];
[view1 addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:view1 attribute:NSLayoutAttributeHeight multiplier:width/height constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeHeight multiplier:width/mainview_height constant:0.0f]];
[self.mainView addConstraint:[NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.mainView attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];

[self.mainView layoutIfNeeded];

Upvotes: 2

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