一，效果图。
二，工程图。
三，代码。
ViewController.h
#import <UIKit/UIKit.h>@interface ViewController : UIViewController
{//loading UIView *backViewLoad; } @end
ViewController.m
#import "ViewController.h"
//loading #import "IanAlert.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //loading [self addLoadingView]; } //点击任何处显示loading -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //loading backViewLoad.hidden=NO; [IanAlert showloading]; [self performSelector:@selector(loadStop) withObject:nil afterDelay:2.0]; } //停止loading -(void)loadStop { backViewLoad.hidden=YES; [IanAlert hideLoading]; } #pragma -mark --loading------ -(void)addLoadingView { backViewLoad=[[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; backViewLoad.backgroundColor=[UIColor blackColor]; backViewLoad.alpha=0.8; backViewLoad.hidden=YES; [self.view addSubview:backViewLoad]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end 
