Making view resize to its parent when added with addSubview

user_213061 0
Viewed 325494

I'm having a problem when using addSubview.

Example code:

ParentView *myParentView = [[ParentView alloc] initWithNibName:@"ParentView " bundle:nil];
ChildeView *myChildeView = [[ChildeView alloc] initWithNibName:@"ChildeView" bundle:nil];

//...  parent frame resized with setFrame lets say to x:0, y:0, W:320, H:411

[[myParentView view] addSubview: [myChildeView view]];

My child when added is bigger then the parent, and does not resize its frame to parent bounds. I can't use "clip subviews" on the parent, and "Autoresize Subviews" seems not to work if the parent frame is not resized again. Is there a property that makes a subview resize automatically to its parent's bounds without using setFrame on every child?

uiview objective-c iphone cocoa-touch
6 Answers

that's all you need 

childView.frame = parentView.bounds
user_6266010

Tested in Xcode 9.4, Swift 4 Another way to solve this issue is , You can add 

override func layoutSubviews() {
        self.frame = (self.superview?.bounds)!
    }

in subview class.

user_34627560

Swift 4 extension using explicit constraints:

import UIKit.UIView

extension UIView {
    public func addSubview(_ subview: UIView, stretchToFit: Bool = false) {
        addSubview(subview)
        if stretchToFit {
            subview.translatesAutoresizingMaskIntoConstraints = false
            leftAnchor.constraint(equalTo: subview.leftAnchor).isActive = true
            rightAnchor.constraint(equalTo: subview.rightAnchor).isActive = true
            topAnchor.constraint(equalTo: subview.topAnchor).isActive = true
            bottomAnchor.constraint(equalTo: subview.bottomAnchor).isActive = true
        }
    }
}

Usage:

parentView.addSubview(childView) // won't resize (default behavior unchanged)
parentView.addSubview(childView, stretchToFit: false) // won't resize
parentView.addSubview(childView, stretchToFit: true) // will resize
user_37838330
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