Metal — it’s a proprietary graphics API made by Apple
Metal — it’s a proprietary graphics API made by Apple
Quartz is a layer beneath SwiftUI or AppKit. SwiftUI is still using Quartz under the hood. The way you use Quartz directly from SwiftUI vs AppKit is a bit different, though still fairly similar. A more fair comparison of the SwiftUI code would be:
struct HelloWorldView: View {
var body: some View {
Canvas { context, _ in
context.draw(
Text("HelloWorld")
.font(.system(size: 24))
.foregroundColor(.black),
at: CGPoint(x: 20, y: 20)
)
}
}
}
Alternatively an AppKit solution (not using Quartz directly) would be something like:
class HelloWorldView: NSView {
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
let text = NSAttributedString(
string: “Hello World”,
attributes: [.font: NSFont.systemFont(ofSize: 24), .foregroundColor: NSColor.black]
)
let label = NSTextField(labelWithAttributedString: text)
addSubview(label)
}
required init?(coder: NSCoder) {
fatalError()
}
}
In either AppKit or SwiftUI, you can access Quartz directly to implement custom views. However, most of the time the UI code you write in either SwiftUI or AppKit won’t call Quartz directly at all, but will instead be composed of built-in views, like (NS)TextField
or (NS)Button
. Under the hood, SwiftUI is mainly just using the AppKit components at the moment, but provides a significantly nicer way to use them (especially in regards to layout and data synchronization).
I don’t think Apple has every really had great backwards compatibility. Apple’s last PowerPC computers shipped in 2005, and in 2009 Snow Leopard released with no PowerPC support. That’s 4 years of upgrades, which is about the same as it is now for macOS.
It an expression that means “I agree with what you just said”
Happy to see those new options in Xcode 15. Those seem really useful.
Yeah not sure why Find Selected Symbol defaults to contains instead of matching. My search results get polluted with other symbols when I search for example MyStruct.image
and MyStruct
also has the property imageName
.
When Apple introduced the iPhone they required automatic reference counting to be used in Objective-C rather than tracing garbage collection (the language supported both) due to performance reasons (iPhones were significantly slower than Macs). At least Apple seems to think that reference counting is faster than tracing garbage collectors. The compiler can do a lot to remove unnecessary releases and retains. Additionally each retain is just incrementing an integer, and each release is just decrementing an integer and comparing the integer to 0, so the overhead is pretty small.