IPhone development swift foundation 09 assets

Assets Set color set on

Using color sets can make the style of applications consistent .

Choose a color

Then use in the code ：
Because the color set is iOS11 New features that have just emerged , Therefore, you need to judge the system version when using .

if #available(iOS 11.0, *){
    
    self.view.backgroundColor = UIColor(named: "ForegroundColor")
}

Running results ：

Assets Set vector picture on

Development in the past , Because you need to adapt to different sizes of screens , Therefore, image resources often need to prepare three sizes @1x、@2x、@3x. But after introducing vector pictures , There is no need to prepare drawings of three sizes .

stay Assets Click “+” Button , Select import “Import…” Options , Then select the vector image to be imported . Here is a red envelope vector graph , The file format is as follows svg At the end of the .

Remember to check the picture attribute “Preserve Vector Data” Options .

Verification code ：

if #available(iOS 11.0, *){
    
    self.view.backgroundColor = UIColor(named: "ForegroundColor")
    
    let imageView = UIImageView(image: UIImage(named: "hongbao"))
    imageView.frame = CGRect(x: 0, y: 0, width: 480, height: 560)
    view.addSubview(imageView)
}

Running results ：