【代碼筆記】iOS-在導航欄中顯示等待對話框

一，效果圖。

二，代碼。

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.
    
    //在導航欄中顯示等待對話框
    [self showActivityIndicatorViewInNavigationItem];
    
}
//點擊任何處，停止等待指示器
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    
    //停止等待指示器，恢復導航欄
    self.navigationItem.titleView = nil;
    self.navigationItem.prompt = nil;
}
#pragma -mark -functions
//在導航欄中顯示等待對話框
-(void) showActivityIndicatorViewInNavigationItem
{
    UIActivityIndicatorView *aiview = [[UIActivityIndicatorView alloc]
                                       initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
    self.navigationItem.titleView = aiview;
    [aiview startAnimating];
    self.navigationItem.prompt = @"數據載入中...";
}

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

@end