objective-c – 如何调整NSImage的大小

我有NSBitmap ImageRep是WxH大小.我创建NSImage并做addRepresentation：.然后我需要调整NSImage的大小.我尝试了setSize方法,但它不起作用.我该怎么办？

解决方法

因为Paresh的方法是完全正确的,而是自10.8以来弃用,我将在下面发布工作的10.8代码.所有这一切都归功于Paresh的答案.

- (NSImage *)imageResize:(NSImage*)anImage newSize:(NSSize)newSize {
    NSImage *sourceImage = anImage;
    [sourceImage setScalesWhenResized:YES];

    // Report an error if the source isn't a valid image
    if (![sourceImage isValid]){
        NSLog(@"Invalid Image");
    } else {
        NSImage *smallImage = [[NSImage alloc] initWithSize: newSize];
        [smallImage lockFocus];
        [sourceImage setSize: newSize];
        [[NSGraphicsContext currentContext] setimageInterpolation:NSImageInterpolationHigh];
        [sourceImage drawAtPoint:NSZeroPoint fromrect:CGRectMake(0,newSize.width,newSize.height) operation:NSCompositecopy fraction:1.0];
        [smallImage unlockFocus];
        return smallImage;
    }
    return nil;
}