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我想在mac OSX应用程序中在我的屏幕上绘制动画gif.我使用这段代码插入gif:我可以看到Gif为1张图片它不会动画只有静态图片:(我应该添加什么才能使其动画？

#import <Cocoa/Cocoa.h>
#import <Quartz/Quartz.h>//for drawing circle
#import "sharedPrefferences.h"
@interface GenericFanSubView : NSView
{
    NSColor * _backgroundColor;
    NSImageView* imageView;
}

- (void)setBackgroundColor :(NSColor*)color;

- (void)insertGif1;
- (void)insertGif2;
- (void)insertGif3;
@end

#import "GenericFanSubView.h"
#define PI 3.14285714285714

@implementation GenericFanSubView

- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
    // Initialization code here.
            imageView = [[NSImageView alloc]initWithFrame:CGRectMake(0, 0,self.frame.size.width,self.frame.size.height)];

        [imageView setAnimates: YES];
    }
    return self;
}

- (void)drawRect:(NSRect)dirtyRect
{
    [super drawRect:dirtyRect];
    // Drawing code here.
    [self drawCircleInRect];
    _backgroundColor = [NSColor whiteColor];
    [self …