如何将动画图标添加到OS X状态栏？

Question

我想在Mac OS状态栏中放置一个图标作为我的cocoa应用程序的一部分.我现在做的是:

NSStatusBar *bar = [NSStatusBar systemStatusBar];

sbItem = [bar statusItemWithLength:NSVariableStatusItemLength];
[sbItem retain];

[sbItem setImage:[NSImage imageNamed:@"Taski_bar_icon.png"]];
[sbItem setHighlightMode:YES];
[sbItem setAction:@selector(stopStart)];

但如果我想要图标动画(3-4帧),我该怎么办？

Answer 1

你需要反复调用-setImage:你的NSStatusItem,在不同的图像每次路过.最简单的方法是使用一个NSTimer和一个实例变量来存储动画的当前帧.

像这样的东西:

/*

assume these instance variables are defined:

NSInteger currentFrame;
NSTimer* animTimer;

*/

- (void)startAnimating
{
    currentFrame = 0;
    animTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/30.0 target:self selector:@selector(updateImage:) userInfo:nil repeats:YES];
}

- (void)stopAnimating
{
    [animTimer invalidate];
}

- (void)updateImage:(NSTimer*)timer
{
    //get the image for the current frame
    NSImage* image = [NSImage imageNamed:[NSString stringWithFormat:@"image%d",currentFrame]];
    [statusBarItem setImage:image];
    currentFrame++;
    if (currentFrame % 4 == 0) {
        currentFrame = 0;
    }
}

Answer 2

我重新编写了Rob的解决方案,以便我可以重用它:

我有帧数9,所有图像名称都有最后一位数作为帧号,这样我每次都可以重置图像来为图标设置动画.

//IntervalAnimator.h

    #import <Foundation/Foundation.h>

@protocol IntervalAnimatorDelegate <NSObject>

- (void)onUpdate;

@end


@interface IntervalAnimator : NSObject
{
    NSInteger numberOfFrames;
    NSInteger currentFrame;
    __unsafe_unretained id <IntervalAnimatorDelegate> delegate;
}

@property(assign) id <IntervalAnimatorDelegate> delegate;
@property (nonatomic) NSInteger numberOfFrames;
@property (nonatomic) NSInteger currentFrame;

- (void)startAnimating;
- (void)stopAnimating;
@end

#import "IntervalAnimator.h"

@interface IntervalAnimator()
{
    NSTimer* animTimer;
}

@end

@implementation IntervalAnimator
@synthesize numberOfFrames;
@synthesize delegate;
@synthesize currentFrame;

- (void)startAnimating
{
    currentFrame = -1;
    animTimer = [NSTimer scheduledTimerWithTimeInterval:0.50 target:delegate selector:@selector(onUpdate) userInfo:nil repeats:YES];
}

- (void)stopAnimating
{
    [animTimer invalidate];
}

@end

如何使用:

1. 符合StatusMenu类中的协议

   //create IntervalAnimator object
   
   animator = [[IntervalAnimator alloc] init];
   
   [animator setDelegate:self];
   
   [animator setNumberOfFrames:9];
   
   [animator startAnimating];
   

2. 实施协议方法

   -(void)onUpdate    {
   
       [animator setCurrentFrame:([animator currentFrame] + 1)%[animator numberOfFrames]];
   
       NSImage* image = [NSImage imageNamed:[NSString stringWithFormat:@"icon%ld", (long)[animator currentFrame]]];
   
       [statusItem setImage:image];
   
   }