Implementation of a singleton class

Singleton class: A class that is probably understood to have only one object, no matter how it is created, only allocates one memory

These days, need to implement a function, and in a lot of classes to call this method, so I Soching encapsulated a class, directly invoke the method inside the class can be implemented, do not need to write the same method every time (this is the big background), Then in the call I found I needed to use the same object every time (with emphasis), so I needed to encapsulate a singleton class, and it wouldn't waste memory.

Okay, here's the code:

+ (uiview*) Initactivityindictionview

{

static UIView *view = nil;

Static dispatch_once_t predicted;

Dispatch_once (&predicted, ^{

view = [[Self alloc]init];

View.bounds = CGRectMake (0, 0, kscreenwidth, 100);

View.center = Cgpointmake (KSCREENWIDTH/2, 50);

Uiactivityindicatorview *testactivityindicator = [[Uiactivityindicatorview alloc]initwithactivityindicatorstyle: Uiactivityindicatorviewstylegray];

Testactivityindicator.center = Cgpointmake (KSCREENWIDTH/2-60, 50);

Testactivityindicator.bounds = CGRectMake (0, 0, 50, 50);

[Testactivityindicator startanimating];

UILabel *label = [[UILabel alloc] Initwithframe:cgrectmake (KSCREENWIDTH/2-30, 25, 120, 50)];

Label.text = @ "trying desperately to load ...";

Label.font = [Uifont systemfontofsize:14];

[View Addsubview:testactivityindicator];

[View Addsubview:label];

});

return view;

}

The above is my own package of a singleton class, test words can create several objects, print (%p) memory can be

Implementation of a singleton class