Initialization method in single-instance mode for iOS development

Initialization method in single-instance mode for iOS development

The general one, we'll write it this way.

+ (Instancetype) sharedxxxmanager{StaticXxxmanager *sharedxxxmanagerinstance =Nil;Static dispatch_once_tpredicate;dispatch_once(&predicate,^{sharedxxxmanagerinstance = [[Xxxmanager alloc] initprivate]; });returnSharedxxxinstance;}

Here in general we will use a private initialization method, where the specified initialization method of the parent class is called.

-(Instancetype) initprivate{ Self= [Super Init];if( Self) {//init}return  Self;}

and to prevent people calling the class from using the Init method , you can override the Init method and throw an exception to remind him that it is a single case.

-(instancetype)init{ @throw [NSException exceptionWithName:@"Singleton" reason:@"Use +[XXXManager sharedXXXManager]" userInfo:nil]; nil;}

Initialization method in single-instance mode for iOS development