iOS學習 - 22 全局跑馬燈

思路：

1.創建一個單例

+ (instancetype)shareManager {
    static CCPaomaView *pModel = nil;
    static dispatch_once_t once;
    dispatch_once(&once, ^{
        pModel = [[CCPaomaView alloc]initWithFrame:CGRectMake(0, 0, KScreenWidth, 0.0468 *KScreenHeight)];
    });
    return pModel;
}

2.把接收的數據存在本地的 plist，不適用於大量數據，每次讀取第一個數據，讀取完成刪除整個 plist，再把剩下的重新存進 plist

3.根據動畫代理，監聽動畫執行結束，將動畫實例置為 nil

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{
    NSLog(@"%@",[self.paomaLabel.layer animationForKey:@"paoMaDeng"]);
    if ([self.paomaLabel.layer animationForKey:@"paoMaDeng"] == anim) {
        //移除第一組數據
        [_array removeObjectAtIndex:0];
        
        //移除整個 plist
        [CCPaomaModel removePaomaPlist];
        
        //重新寫入
        [_array writeToFile:[CCPaomaModel filename] atomically:YES];
        
        //動畫停止之後，將實例置為 nil
        _pmAniamtion = nil;
        
        //數組為空之後移除跑馬燈
        if (_array.count > 0) {
            [self showPaomaView:self.superview];
        }else{
            self.hidden = YES;
            [self removeFromSuperview];
        }
        NSLog(@"%@",self.array);
    }
}

4.判斷動畫實例是否為空，使得切換界面，跑馬燈繼續，而不是重新開始

- (void)paomaAniamtion:(CGFloat)count{
    //判斷動畫實例存不存在，存在繼續，不存在即創建
    if (_pmAniamtion == nil) {
        _pmAniamtion = [CABasicAnimation animation];
        _pmAniamtion.keyPath = @"transform.translation.x";
        CGFloat W = CGRectGetWidth(_paomaLabel.bounds);
        _pmAniamtion.fromValue = @(W);
        _pmAniamtion.toValue = @(-W);
        _pmAniamtion.duration = _aniTime;
        _pmAniamtion.repeatCount = count;
        _pmAniamtion.removedOnCompletion = NO;       //動畫結束不移除
        _pmAniamtion.fillMode = kCAFillModeForwards; //動畫結束會保持結束的狀態
        _pmAniamtion.delegate = self;                //設置代理
        [_paomaLabel.layer addAnimation:_pmAniamtion forKey:@"paoMaDeng"];
    }else{
        _pmAniamtion.repeatCount = count;
    }
}

5.切換界面，暫停、恢復動畫

#pragma mark -- 界面出現、消失，創建、恢復、暫停動畫
- (void)viewWillAppear:(BOOL)animated {
    [_paomaView showPaomaView:self.view];
    [_paomaView resumeAnimation];
}

- (void)viewWillDisappear:(BOOL)animated {
    [_paomaView pauseAniamtion];
}

話不多說，github 見代碼