Swift 如何在Cocoa中的NSView中移动NSImageView?
在我的Mac OS应用程序中,在NSImageView中发生鼠标下降事件(由用户触发)后,我需要一种能够在NSView中移动NSImageView的功能。当用户触发鼠标上升事件时,此视图必须移动到最后一个mouseDrag事件方向并保持不变。在移动过程中,我希望NSImageView在屏幕上可见(它应该随着鼠标光标移动) 我读过苹果公司的鼠标事件处理指南, 我还下载了以下示例代码: 两个链接都包含Objective C中的代码。DragItemAround的代码已过时。我试图在GitHub和其他StackOverflow线程上搜索解决方案,但没有找到任何有效的解决方案 我很高兴听到关于这个问题的答案。我用的是Swift 3 我创建了一个自定义MovableMageView,它是NSImageView的一个子类,代码如下:Swift 如何在Cocoa中的NSView中移动NSImageView?,swift,cocoa,nsview,nsimageview,nsevent,Swift,Cocoa,Nsview,Nsimageview,Nsevent,在我的Mac OS应用程序中,在NSImageView中发生鼠标下降事件(由用户触发)后,我需要一种能够在NSView中移动NSImageView的功能。当用户触发鼠标上升事件时,此视图必须移动到最后一个mouseDrag事件方向并保持不变。在移动过程中,我希望NSImageView在屏幕上可见(它应该随着鼠标光标移动) 我读过苹果公司的鼠标事件处理指南, 我还下载了以下示例代码: 两个链接都包含Objective C中的代码。DragItemAround的代码已过时。我试图在GitHub和其他
import Cocoa
class MovableImageView: NSImageView {
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
// Drawing code here.
// setup the starting location of the
// draggable item
}
override func mouseDown(with event: NSEvent) {
Swift.print("mouseDown")
//let window = self.window!
//let startingPoint = event.locationInWindow
}
override func mouseDragged(with event: NSEvent) {
Swift.print("mouseDragged")
self.backgroundColor = NSColor.black
}
override func mouseUp(with event: NSEvent) {
Swift.print("mouseUp")
}
}
之后,在Interface Builder中,我将该类设置为NSImageView。我还在Interface Builder中为此NSImageView设置了约束
现在我想知道如何在NSView中移动NSImageView?(Swift 3,XCode 8)您需要保存鼠标下降点,并在以后用于偏移。请检查以下代码:
class MovableImageView: NSImageView {
var firstMouseDownPoint: NSPoint = NSZeroPoint
init() {
super.init(frame: NSZeroRect)
self.wantsLayer = true
self.layer?.backgroundColor = NSColor.red.cgColor
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
// Drawing code here.
}
override func mouseDown(with event: NSEvent) {
Swift.print("mouseDown")
firstMouseDownPoint = (self.window?.contentView?.convert(event.locationInWindow, to: self))!
}
override func mouseDragged(with event: NSEvent) {
Swift.print("mouseDragged")
let newPoint = (self.window?.contentView?.convert(event.locationInWindow, to: self))!
let offset = NSPoint(x: newPoint.x - firstMouseDownPoint.x, y: newPoint.y - firstMouseDownPoint.y)
let origin = self.frame.origin
let size = self.frame.size
self.frame = NSRect(x: origin.x + offset.x, y: origin.y + offset.y, width: size.width, height: size.height)
}
override func mouseUp(with event: NSEvent) {
Swift.print("mouseUp")
}
}
在父视图中,只需将此MovableMageView添加为子视图,如下所示:
let view = MovableImageView()
view.frame = NSRect(x: 0, y: 0, width: 100, height: 100)
self.view.addSubview(view) //Self is your parent view
@brianlikeaple答案的约束版本:
class MovableImageView: NSImageView {
var firstMouseDownPoint: NSPoint = NSZeroPoint
var xConstraint: NSLayoutConstraint!
var yContstraint: NSLayoutConstraint!
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.wantsLayer = true
self.layer?.backgroundColor = NSColor.red.cgColor
}
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
// Drawing code here.
}
override func mouseDown(with event: NSEvent) {
Swift.print("mouseDown")
firstMouseDownPoint = (self.window?.contentView?.convert(event.locationInWindow, to: self))!
}
override func mouseDragged(with event: NSEvent) {
Swift.print("mouseDragged")
let newPoint = (self.window?.contentView?.convert(event.locationInWindow, to: self))!
let offset = NSPoint(x: newPoint.x - firstMouseDownPoint.x, y: newPoint.y - firstMouseDownPoint.y)
let origin = self.frame.origin
let size = self.frame.size
yContstraint.constant = (self.superview?.frame.height)! - origin.y - offset.y - size.height
xConstraint.constant = origin.x + offset.x
}
override func mouseUp(with event: NSEvent) {
Swift.print("mouseUp")
}
你把一个错误的生物分类了。改为子类NSView。@ElTomato否,NSImageVIew是NSControl的子类,NSControl是NSView的子类。所以这应该没问题,这太傻了。Adelmaer说,他或她有一个NSView容器,其中包含一个或多个要用鼠标指针重新定位的对象。在这种情况下,您应该子类化NSView。@ElTomato NSImageView最终从NSView继承,将NSImageView放在NSView中是非常常见的OOP。怎么了?