The usage of Uiactivityindicatorview in IOS and the example of gear waiting animation _ios

Basis
@ derives from UIView, so it is a view, or it can be attached to a view.
I. Creating

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Because the size of the Uiactivityindicatorview is fixed, you can set it directly. Center
uiactivityindicatorview* Activityindicatorview = [[Uiactivityindicatorview alloc]
Initwithframe:cgrectmake (250.0,20.0,30.0,30.0)];

Two. property settings style

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Activityindicatorview.activityindicatorviewstyle= Uiactivityindicatorviewstylegray;

The system offers you 3 different styles:

• Uiactivityindicatorviewstylewhitelarge Large White Indicator
• Uiactivityindicatorviewstylewhite Standard size White indicator
• Uiactivityindicatorviewstylegray Gray indicator, for white background

To set the Hideswhenstoped property to Yes if you want the indicator to be automatically hidden after it stops. The default is yes. The indicator will still appear when set to No stop.

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activityindicatorview.hideswhenstoped = NO;

Three. Show

You can attach it to any view, such as a table cell, or a view:

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[Self.view Addsubview:activityindicatorview];

Four. Start and stop (can be used with Nstimer, as a parameter userinfo to pass in)

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[Activityindicatorview startanimating];//Boot

[Activityindicatorview stopanimating];//Stop

@ Network Activity Indicator
When your application uses the network, you should put a network indicator on the iphone's status bar to warn users that they are using the network.
At this point you can use a uiapplication named Networkactivityindicatorvisible attribute.
You can enable or disable network indicators by setting this: uiapplication* app = [UIApplication sharedapplication];
app.networkactivityindicatorvisible = YES;

Gear Wait Animation instance

Uiactivityindicatorview provides a lightweight view that displays a standard rotational progress wheel, as long as it is added to the program, start and stop in the appropriate place. The start can be adsorbed in the current view, the stop will be removed ~

The effect of a simple answer:

The implementation method is as follows:

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Self.activityindicatorview=[[uiactivityindicatorview alloc]initwithframe:cgrectmake (0, 0, 100, 100)];
Self.activityindicatorview.center=self.view.center;
[Self.activityindicatorview Setactivityindicatorviewstyle:uiactivityindicatorviewstylegray];
[Self.activityindicatorview Setactivityindicatorviewstyle:uiactivityindicatorviewstylewhitelarge];
[Self.activityindicatorview Setbackgroundcolor:[uicolor Lightgraycolor]];
[Self.view AddSubview:self.activityIndicatorView];
[Self.activityindicatorview startanimating];

The code is very simple, set the frame this needless to say, about style setting, there are three kinds of white and gray, both sizes are 20*20, the big white picture is 37*37:

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typedef ns_enum (Nsinteger, Uiactivityindicatorviewstyle) {
Uiactivityindicatorviewstylewhitelarge,
Uiactivityindicatorviewstylewhite,
Uiactivityindicatorviewstylegray,
};

To turn off animations:

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Dispatch_after (Dispatch_time Dispatch_time_now, (int64_t) (5* nsec_per_sec)), Dispatch_get_global_queue (DISPATCH_ Queue_priority_default, 0), ^{
[Self.activityindicatorview stopanimating];
});