【代码笔记】iOS-在导航栏中显示等待对话框

一，效果图。

二，代码。

ViewController.m

#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