CODEWITHSUNDEEP
iosuiviewautolayout
darbid
darbid

Reputation: 2731

How to get UIView to layout properly before making it into an image

I am using this code to render a UIView into an image

-(UIImage *)getImageForView:(UIView *)aView {     
UIGraphicsBeginImageContextWithOptions(aView.bounds.size, NO, 0.0);
[aView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return viewImage;
}

The issue that I am having is that the view is not set out properly using autolayout. What should I do.

I currently create a UIView "viewA" with a frame which is the correct size for my view and then create my complicated intended view "ViewB" (which has auto layout on) and then add viewB as a subview to "viewA" then i give viewA to my above method.

First I thought viewA would not have to be added to some superview but it does not layout properly, should I be adding viewA with an alpha of 0 to a superview, then I assume maybe an "layoutIfNeeded" could be used but on which view should I do this?

Edit: Here is the code that creates the UIView

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 439)];

//This is the UIView that contains a lot of views
MyView *myView = [[MyView alloc] init];

myView.translatesAutoresizingMaskIntoConstraints = NO;

[view addSubview:myView];

[view addConstraints:[NSLayoutConstraint
                      constraintsWithVisualFormat:@"V:[myView(439)]"
                      options:0
                      metrics:nil
                      views:NSDictionaryOfVariableBindings(myView)]];

[view addConstraints:[NSLayoutConstraint
                      constraintsWithVisualFormat:@"H:[myView(320)]"
                      options:0
                      metrics:nil
                      views:NSDictionaryOfVariableBindings(myView)]];

What Worked for me in the end

[myView layoutIfNeeded];
[view layoutIfNeeded];

In other words calling it on both views.

Upvotes: 4

Views: 829

Answers (1)

anon
anon

Reputation:

Send your view a layoutIfNeeded message before rendering it in your image context.

Upvotes: 8

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