Two algorithms,

-(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.< Span class= "S5" >lifeview. Frame. Origin. Yself. Lifeview. Frame. Size. Widthself. 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.< Span class= "S5" >lifeview. Frame. Origin. Yself. Lifeview. Frame. Size. Widthself. Lifeview. Frame. Size. Height

}

Two algorithms,