IOS开发GraphicsContext应用类是本文要介绍的内容，主要是来认识并学习GraphicsContext应用类的使用方法，具体内容来看本文详解。
1、CGContext类。
2、UIView::DrawRect函数
3、UIGraphicsGetCurrentContext()函数
4、UIView坐标系和Quartz坐标系相反。
5、CGContextRef myContext = [[NSGraphicsContext currentContext] graphicsPort];
6、initWithFrame, intWithCoder, DrawRect
7、CGPDFContextCreateWithURL, CGPDFContextCreate
CFURLCreateWithFileSystemPath(), CGDataConsumerCreateWithURL()
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8、iOS 推荐使用 UIGraphicsBeginImageContextWithOptions，它会自动做Quartz和UIKit之间的坐标变换。
9、CGBitmapContextCreate
10、Pixel Format
NULL color space:
kCGImageAlphaoOnly 8bpp = A8
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Gray color space:
kCGImageAlphaNone 8bpp = L8
kCGImageAlphaOnly 8bpp = A8
kCGImageAlphaNone 16bpp = L16
KCGImageAlphaNone|kCGBitmapfloatComponents = L32F
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RGB color space:
kCGImageAlphaNoneSkipFirst, 16bpp, 5bpc = R5G5B5X1
kCGImageAlphaNoneSkipFirst, 32bpp, 8bpc = R8G8B8X8
kCGImageAlphaNoneSkipLast, 32bpp, 8bpc = X8R8G8B8
kCGImageAlphaPremultipliedFirst, 32bpp, 8bpc = R8G8B8A8
kCGImageAlphaPremultipliedLast, 32bpp, 8bpc = A8R8G8B8
kCGImageAlphaPremultipledLast, 64bpp, 16bpc = A16R16G16B16
kCGImageAlphaNonSkipLast, 64bpp, 16bpc = X16R16G16B16
kCGImageAlphaNoneSkipLast|kCGBitmapFloatComponents, 128bpp, 32bpc = X32R32G32B32F
kCGImageAlphaPremultipliedLast | kCGBitmapFloatComponents, 128bpp, 32bpc = A32R32G32B32F
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CMYK space:
- kCGImageAlphaNone 32bpp, 8bpc = C8M8Y8K8
kCGImageAlphaNone 64bpp, 16bpx = C16M16Y16K16
kCGImageAlphaNone|kCGBitmapFloatComponents = C32M32Y32K32F
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11、
CGContextSetShouldAntialias for bitmap context,
CGContextSetAllowAntialasing for graphics context.
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小结：详解IOS开发GraphicsContext应用类的内容介绍完了，希望通过本文的学习能对你有所帮助！
