如何在iPhone应用程序中显示加载栏或进度条以获取数据 [英] how to show a loading bar or progress bar in iPhone application whiele fetching data

问题描述

我在加载视图时有一个iPad应用程序，我在一段时间后调用方法，所以我想显示一个加载栏，直到调用方法并加载数据。

I have an iPad application when view is loaded, i am calling method after some time duration so i want to display a loading bar till method is called and data is loaded.

我正在使用 NSTimer 来调用中的方法viewDidLoad

[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(loadNews) userInfo:nil repeats:NO];

推荐答案

使用活动指示器显示进度条或加载视图。 ...如下所示....在viewdidload ..

Use Activity Indicator to show progress bar or loading view.... like below.... in viewdidload..

CGRect frame = CGRectMake(0.0, 0.0, 25.0, 25.0);
    self.activityIndicator = [[UIActivityIndicatorView alloc]
                              initWithFrame:frame];
    [self.activityIndicator sizeToFit];
    self.activityIndicator.autoresizingMask =
    (UIViewAutoresizingFlexibleLeftMargin |
     UIViewAutoresizingFlexibleRightMargin |
     UIViewAutoresizingFlexibleTopMargin |
     UIViewAutoresizingFlexibleBottomMargin);
    [activityIndicator startAnimating];

    UIBarButtonItem *loadingView = [[UIBarButtonItem alloc] 
                                    initWithCustomView:self.activityIndicator];
    loadingView.target = self;
    self.navigationItem.rightBarButtonItem = loadingView;

这篇关于如何在iPhone应用程序中显示加载栏或进度条以获取数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！