How to get correct size or bounds of UIView in Swift 2.0?

Question

Hi i'm having trouble to apply gradient color to my UIView. It is correctly applied, but the color bounds varies with horizontal & portrait orientation.

if I set correctly on Portrait orientation, then the gradient view's bounds are not changed when I flip the device to horizontal.

So, How to get correct constraints and size of the UIView for both horizontal and portrait device orientation?.

Thanks a lot for your help!!!

Code I have tried:

import UIKit

class ViewController: UIViewController {


    @IBOutlet var viewBar: UIView!


    override func viewDidLoad() {
        super.viewDidLoad()

        viewBar.layer.shadowOpacity = 0.5
        viewBar.layer.shadowOffset = CGSize(width: 3.0, height:2.0)
        viewBar.layer.shadowRadius = 5.0
        viewBar.layer.shadowColor = UIColor.blueColor().CGColor

        let gradient: CAGradientLayer = CAGradientLayer()

        gradient.colors = [UIColor.blueColor().CGColor, UIColor.redColor().CGColor]
        gradient.locations = [0.0 , 1.0]
        gradient.startPoint = CGPoint(x: 0.0, y: 1.0)
        gradient.endPoint = CGPoint(x: 1.0, y: 1.0)
        gradient.frame.size = self.viewBar.bounds.size

        self.viewBar.layer.insertSublayer(gradient, atIndex: 0)

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }


}

Coding output:

Answer 1

In viewDidLoad the layout haven't happened yet, so you got the wrong frame, move the gradient.frame.size = self.viewBar.bounds.size to either viewDidLayoutSubviews: or viewWillAppear: so that your gradient gets the correct frame.

  override func viewDidLayoutSubviews() {
    gradient.frame.size = self.viewBar.bounds.size
  }

Answer 2

Check your device orientation in viewDidLayoutSubViews using this method.

+(NSString*)checkDeviceOrientation
{
    NSString *deviceOrientation;

    if ([[UIDevice currentDevice]orientation]== UIInterfaceOrientationLandscapeLeft ) {

        deviceOrientation = @"landscape left mode";
    }
    else if ([[UIDevice currentDevice]orientation]==UIInterfaceOrientationLandscapeRight){
        deviceOrientation = @"landscape right mode";
    }
    else{
        deviceOrientation = @"potrait mode";
    }
    return deviceOrientation;
}

Then in viewDidLayoutSubviews call this function like this,

-(void)viewDidLayoutSubview
{
if(IS_PHONE4)
if([self.checkDeviceOrientation isEqualtoString;@"landscape right mode"])
{
   NSLog(@"Get your view size%@",self.view.frame.size.width);
}

if(IS_IPHONE5)
if([self.checkDeviceOrientation isEqualtoString;@"landscape right mode"])
{
   NSLog(@"Get your view size%@",self.view.frame.size.width);
}
.....

}

Also remember to put these constants in any file, you want.

#define IS_IPAD             (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE           (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_IPHONE4          (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 480.0f || IS_IPHONE && [[UIScreen mainScreen]bounds].size.width == 480.0f)
#define IS_IPHONE5          (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 568.0f || IS_IPHONE && [[UIScreen mainScreen]bounds].size.width == 568.0f)
#define IS_IPHONE6          (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 667.0 || IS_IPHONE && [[UIScreen mainScreen]bounds].size.width == 667.0f)
#define IS_IPHONE6PLUS      (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 736.0 || IS_IPHONE && [[UIScreen mainScreen]bounds].size.width == 736.0f)
#define IS_RETINA           ([[UIScreen mainScreen] respondsToSelector:@selector(displayLinkWithTarget:selector:)] && ([UIScreen mainScreen].scale == 2.0))

I am unfamiliar with Swift code but hope, it will help you.