两个算法，

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-(void)lifeViewAnimation

{

    static int a = 0;

    static BOOL isAdd = NO;

    if (a >= 310) {

        a = a - 3;

        isAdd = NO;

    }else if(a == 0){

        a = a + 3;

        isAdd = YES;

    }else if (isAdd)

    {

        a = a + 3;

    }else if (!isAdd)

    {

        a = a - 3;

    }

    self.lifeView.frame = CGRectMake(a, self.lifeView.frame.origin.y, self.lifeView.frame.size.width, self.lifeView.frame.size.height);

}

-(void)lifeViewAnimation

{

    static int a = 0;

    static int beforeA = 0;

    static BOOL isPlus = YES;

    if(a <= 0) {

        isPlus = YES;

    }

    if(a >= self.view.frame.size.width){

        isPlus = NO;

    }

    beforeA = a;

    if (isPlus) {

        a = a + 3;

    }else{

        a = a - 3;

    }

    if (a == beforeA+3) {

        isPlus = YES;

    }else{

        isPlus = NO;

    }

     self.lifeView.frame = CGRectMake(a, self.lifeView.frame.origin.y, self.lifeView.frame.size.width, self.lifeView.frame.size.height);

}

两个算法，

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原文地址：http://www.cnblogs.com/guligei/p/4218644.html