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 = @"數據加載中..."; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end

轉載于:https://www.cnblogs.com/yang-guang-girl/p/7416558.html

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