一，效果图。

二，工程图。

三，代码。

RootViewController.h

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

 

RootViewController.m

#import "RootViewController.h"
//加入头文件
#import "BGMovingComponent.h"


@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    //初始化背景图
    [self addView];
    //初始化云
    [self addCloudView];
    
}
#pragma -mark -functions
//初始化背景图
-(void)addView
{
    self.title=@"浮动的云";
}
//初始化云
-(void)addCloudView
{
    BGMovingComponent *cloud = [[BGMovingComponent alloc] initWithFrame:CGRectMake(0, 0, 320, 60)];
    [self.view addSubview:cloud];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}