cocoa: Add NSTextField

[tmc]

Fixes #120

[programmingkidx]

I'm not sure why but I could not make my program run. It uses NSTextField so I was hoping it would work now. Here it is:

package main

import "github.com/progrium/macdriver/cocoa"
import "github.com/progrium/macdriver/objc"
import "github.com/progrium/macdriver/core"

func main() {
	app := cocoa.NSApp_WithDidLaunch(func(n objc.Object) {
		win := cocoa.NSWindow_New()
		win.SetTitle("Hello world")
		label := cocoa.NSTextField_alloc()
		rect := core.NSMakeRect(10,10,70,20)
		label.InitWithFrame__asNSControl(rect)
		message := core.NSString_FromString("Hello from label")
		label.SetStringValue_(message)
		win.ContentView().AddSubview_(label)
		win.MakeKeyAndOrderFront(nil)
	})
	
	app.SetActivationPolicy(cocoa.NSApplicationActivationPolicyRegular)
	app.ActivateIgnoringOtherApps(true)
	app.Run()
}

I recreated my project several times. I start with running 'go mod init program'. Then I use these commands:

• go get github.com/progrium/macdriver/cocoa
• go get github.com/progrium/macdriver/core
• go get github.com/progrium/macdriver/objc

For some reason I still keep seeing this error:
./main.go:11:18: undefined: cocoa.NSTextField_alloc

The mod file says I am using MacDriver 0.3.0. Hopefully a new tag will make things clearer in the future. I could be still using an old version of MacDriver but I don't know how to check. Does anyone know what is wrong?

[progrium]

use go get github.com/progrium/macdriver/cocoa@main to work with latest.

[programmingkidx]

@progrium Thank you! It works now 😁.