Question

根据图像的Cocoa绘图指南documentation，NSImage可以加载Windows游标.cur文件。

但是如何获得NSCursor - initWithImage:(NSImage *)newImage hotSpot:(NSPoint)point;所需的热点？

Answer 1

正如文件中所说，

在OS X v10.4及更高版本中，NSImage使用Image I / O框架支持许多其他文件格式。

让我们抓住a sample cursor file并在Swift游乐场进行实验：

import Foundation
import ImageIO

let url = Bundle.main.url(forResource: "BUSY_L", withExtension: "CUR")! as CFURL
let source = CGImageSourceCreateWithURL(url, nil)!
print(CGImageSourceCopyPropertiesAtIndex(source, 0, nil)!)

输出：

{
    ColorModel = RGB;
    Depth = 8;
    HasAlpha = 1;
    IsIndexed = 1;
    PixelHeight = 32;
    PixelWidth = 32;
    ProfileName = "sRGB IEC61966-2.1";
    hotspotX = 16;
    hotspotY = 16;
}

所以，要安全地获取热点：

import Foundation
import ImageIO

if let url = Bundle.main.url(forResource: "BUSY_L", withExtension: "CUR") as CFURL?,
    let source = CGImageSourceCreateWithURL(url, nil),
    let properties = CGImageSourceCopyPropertiesAtIndex(source, 0, nil) as? [String: Any],
    let x = properties["hotspotX"] as? CGFloat,
    let y = properties["hotspotY"] as? CGFloat
{
    let hotspot = CGPoint(x: x, y: y)
    print(hotspot)
}

输出：

(16.0, 16.0)

Windows游标中的热点.cur由NSImage加载？

1 个答案: