7

SwiftUI Bug – PlainButtonStyle Button 触发次数异常

 3 years ago
source link: https://www.hawu.me/coding/2591
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.
neoserver,ios ssh client

SwiftUI Bug – PlainButtonStyle Button 触发次数异常

Base on macOS 10.15, Xcode 11.7.

1、当程序运行在非活跃状态时，且 NSWindow 为默认样式（可关闭、缩放、有标题栏等）。

此时如果点击 NSWindow 中的按钮，一般情况下会将该 NSWindow 变成活跃状态，同时触发按钮的 action 一次。但对于 PlainButtonStyle 样式的按钮，却无法触发其事件函数！

2、当程序运行在非活跃状态时，且 NSWindow 为空样式（styleMask = []），且允许拖动（isMovableByWindowBackground = true）。

此时如果点击 NSWindow 中的按钮，一般情况下会将该 NSWindow 变成活跃状态，同时触发按钮的 action 一次。但对于 PlainButtonStyle 样式的按钮，却会触发其事件函数两次！

ContentView.swift
AppDelegate.swift
import SwiftUI
struct ContentView: View {
var body: some View {
VStack {
Button("Normal") {
NSLog("normal Button clicked")
Button(action: {
NSLog("LinkButton clicked")
Text("LinkButton")
}.buttonStyle(LinkButtonStyle())
Button(action: {
NSLog("BorderedButton clicked")
Text("BorderedButton")
}.buttonStyle(BorderedButtonStyle())
Button(action: {
NSLog("BorderlessButton clicked")
Text("BorderlessButton")
}.buttonStyle(BorderlessButtonStyle())
Button(action: {
NSLog("PlainButton clicked")
Text("PlainButton")
}.buttonStyle(PlainButtonStyle())
}.frame(width: 400, height: 300)
import SwiftUI

struct ContentView: View {
    var body: some View {
        VStack {
            Button("Normal") {
                NSLog("normal Button clicked")
            }
            
            Button(action: {
                NSLog("LinkButton clicked")
            }){
                Text("LinkButton")
            }.buttonStyle(LinkButtonStyle())
            
            Button(action: {
                NSLog("BorderedButton clicked")
            }){
                Text("BorderedButton")
            }.buttonStyle(BorderedButtonStyle())
            
            Button(action: {
                NSLog("BorderlessButton clicked")
            }){
                Text("BorderlessButton")
            }.buttonStyle(BorderlessButtonStyle())
            
            Button(action: {
                NSLog("PlainButton clicked")
            }){
                Text("PlainButton")
            }.buttonStyle(PlainButtonStyle())
            
        }.frame(width: 400, height: 300)
    }
}
import Cocoa
import SwiftUI

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    var window: NSWindow!


    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Create the SwiftUI view that provides the window contents.
        let contentView = ContentView()

         // 👇 When App runs in backend, PlainButtonStyle Button could be triggered
        window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),
            styleMask: [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView],
            backing: .buffered, defer: false)
        
        // 👇 When App runs in backend, PlainButtonStyle Button trigger twice
//        window = NSWindow(
//            contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),
//            styleMask: [],
//            backing: .buffered, defer: false)
//        window.isMovableByWindowBackground = true
        
        
        window.center()
        window.setFrameAutosaveName("Main Window")
        window.contentView = NSHostingView(rootView: contentView)
        window.makeKeyAndOrderFront(nil)
    }

    func applicationWillTerminate(_ aNotification: Notification) {
        // Insert code here to tear down your application
    }
}

我把项目中的所有 PlainButtonStyle 按钮全部改成 BorderlessButtonStyle 了。


report

Recommend

About Joyk


Aggregate valuable and interesting links.
Joyk means Joy of geeK