#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //在导航栏中显示等待对话框

    [self showActivityIndicatorViewInNavigationItem];

}

//点击任何处，停止等待指示器

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    //停止等待指示器，恢复导航栏

    self.navigationItem.titleView = nil;

    self.navigationItem.prompt = nil;

}

#pragma -mark -functions

//在导航栏中显示等待对话框

-(void) showActivityIndicatorViewInNavigationItem

{

    UIActivityIndicatorView *aiview = [[UIActivityIndicatorView alloc]

                                       initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];

    self.navigationItem.titleView = aiview;

    [aiview startAnimating];

    self.navigationItem.prompt = @"数据加载中...";

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end