NSView NSImage NSData转换

NSBitmapImageRep *bitmap =[view bitmapImageRepForCachingDisplayInRect:[view visibleRect]];
[view cacheDisplayInRect:[view visibleRect] toBitmapImageRep:bitmap];
NSImage *image = [[NSImage alloc] initWithSize:NSMakeSize(width, height)];
[image addRepresentation:bitmap];
NSBitmapImageRep *bitmap = [NSBitmapImageRep imageRepWithData:data];
NSBitmapImageRep *bitmap = [[[NSBitmapImageRep alloc] initWithCGImage:CGImage];
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