Arc and MRC compatible single-case mode

One, under the arc of the single example implementation

Description: The user-instantiated method controls a single execution, while opening a single-instance initialization method.

-(instancetype) init{    self=[super init];    if (self) {        static dispatch_once_t Oncetoken;        Dispatch_once (&oncetoken, ^{        });    }    return self;    } static ID instance; + (Instancetype) Allocwithzone: (struct _nszone *) zone{     static dispatch_once_t Oncetoken;    Dispatch_once (&oncetoken, ^{     instance=[super allocwithzone:zone];     }); return instance;}   + (instancetype) shareaudio{    static dispatch_once_t Oncetoken;    Dispatch_once (&oncetoken, ^{     instance=[[self alloc]init];     });     return instance; }  + (ID) copywithzone: (struct _nszone *) zone{     return instance;}

Second, the single-instance implementation under MRC

Description: In the user instantiation of the method to control a single execution, while opening a singleton initialization method, due to the current MRC so need to control the memory management method single execution, so compared to arc need to increase:

 
static ID instance;     + (Instancetype) Allocwithzone: (struct _nszone *) zone{static dispatch_once_t Oncetoken;     Dispatch_once (&oncetoken, ^{instance=[super Allocwithzone:zone];     }); return instance;     } + (Instancetype) shareaudio{static dispatch_once_t Oncetoken;     Dispatch_once (&oncetoken, ^{instance=[[self Alloc]init];     }); return instance;  }-(OneWay void) release{}-(Instancetype) autorelease{return instance;}  -(Instancetype) retain{return instance;} -(Nsuinteger) retaincount{return 1;} 
 

Third, compatible with MRC and ARC macro definition

Note: In order to facilitate late reference, you can extract the singleton as a macro definition, given that the current manual count and automatic count are taken into account when extracting the conditional compilation:

#if!__has_feature (OBJC_ARC) ====== is currently arc#else====== MRC#ENDIF code: #define SINGLETON_H (name) + (instancetype) share# #name; #if!__has_feature (OBJC_ARC) #define SINGLETON_M (name) static ID instance;+ (instancetype) Allocwithzone: (struct    _nszone *) zone{static dispatch_once_t Oncetoken;    Dispatch_once (&oncetoken, ^{instance=[super Allocwithzone:zone];    }); return instance;}    + (instancetype) share# #name {static dispatch_once_t oncetoken;    Dispatch_once (&oncetoken, ^{instance=[[self Alloc]init];    }); return instance;} -(OneWay void) release{}-(instancetype) autorelease{return instance;} -(Instancetype) retain{return instance;} + (ID) copywithzone: (struct _nszone *) zone{return instance;} -(Nsuinteger) retaincount{return 1;} #else # define SINGLETON_M (name) static ID instance;+ (instancetype) Allocwithzone: (struct _nszone *) zone{Static Dispatch  _once_t Oncetoken;  Dispatch_once (&oncetoken, ^{instance=[super allocwithzone:zone];}); Return Instance;}  + (instancetype) share# #name {static dispatch_once_t oncetoken;  Dispatch_once (&oncetoken, ^{instance=[[self Alloc]init];  }); return instance;} + (ID) copywithzone: (struct _nszone *) zone{return instance;} #endif

Iv. file references

1 references in. h Files Singleton_h (audio);

2 references in. m Files Singleton_m (audio);

Arc and MRC compatible single-case mode