github下载地址：https://github.com/MoonXYX/XYXCirculateView

if you want to use this library,just a few steps: 

Firstly,import the name of the library --> XYXCirculateView 

Than write the following lines of code

// create object

XYXCirculateView *circulate = [[XYXCirculateViewalloc]initWithFrame:CGRectMake(0,0,self.view.bounds.size.width,200)];

// add view

[self.viewaddSubview:circulate];

//set images to show (the number of iamge is free)

circulate.imagesArray = @[[UIImageimageNamed:@"imagename1"],[UIImageimageNamed:@"imagename2"],[UIImageimageNamed:@"imagename3"],[UIImageimageNamed:@"imagename4"]];

//the following code is not necessary (currentColor default is green ,otherColor default is gray)

circulate.currentColor = [UIColorredColor];  circulate.otherColor = [UIColordarkGrayColor];