Judge the problem when there is no network, and the screen when the network is not prompt.

Learning to write programs in iOS often determines that there is a problem that crashes when there is no network.

Initializing data

-(void) _loaddata

{

//Send network request

< Span style= "COLOR: #000000" >    [ wxdataservice requestafwithurl : @ "Fill request URL" params : nil requestheader : nil HttpMethod : @ "Get or fill post" block :^ ( nsobject *result) {

//I will crash when I'm out of the net.

if ([Result iskindofclass: [nserror class]]) {

return [selfinternetfail];// can call a method that shows the screen when it is not on the network.

}

NSLog (@ "result:%@", result);

//Create variable array to hold models

nsmutablearray *models=[[nsmutablearrayalloc]init];

nsdictionary *results = (nsdictionary *) result;

nsarray *datas = results[@ "Datas"];

for (nsdictionary *dic in Datas) {

nsarray *infos = dic[@ "Infos"];

for (nsdictionary *subdic in Infos) {

NSLog (@ "infos=%@", infos);

Ticketmodel *model=[[ticketmodelalloc]initwithcontentsofdic: Subdic];

[Models AddObject: Model];

}

Self. dataList = models;

[_tableview reloaddata];//reload Refresh table view.

}

}];

}

/*

Prompt when no network

such as loading such a screen

*/

Network Load Failure Popup interface call

-(void) Internetfail

{

uiimageview *imageview=[[uiimageviewalloc]initwithframe:cgrectmake (a);

ImageView. Image =[UIImageimagenamed:@ "[email protected]"];

[Self. View addsubview: ImageView];

UILabel *label=[[UILabelalloc]init];

Label. frame=cgrectmake(kscreenwidth,max, +--) ;

Label. text=@ "Pro, message failed to load";

label. Font =[uifontboldsystemfontofsize:];

[Self. View addsubview: label];

UILabel *label1=[[UILabelalloc]init];

Label1. frame=cgrectmake(+, +,kscreenwidth-+);

Label1. text =@ "Please check your phone network settings and click Reload";

Label1. Font =[uifontboldsystemfontofsize:];

Label1. numberoflines=0;

[Self. View addsubview: Label1];

}

Judge the problem when there is no network, and the screen when the network is not prompt.