Objective-C实现图片生成缩略图

/** 由图片生成缩略图 */ static NSImage *ATThumbnailImageFromImage(NSImage *image) {      NSSize imageSize = [image size];     CGFloat imageAspectRatio = imageSize.width / imageSize.height;     NSSize thumbnailSize = NSMakeSize(THUMBNAIL_HEIGHT * imageAspectRatio, THUMBNAIL_HEIGHT);     NSImage *thumbnaiImage = [[NSImage alloc] initWithSize:thumbnailSize];      [thumbnaiImage lockFocus];     [image drawInRect:NSMakeRect(0, 0, thumbnailSize.width, thumbnailSize.height) fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];     [thumbnaiImage unlockFocus];     return thumbnaiImage; }

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