One-sentence OC Singleton mode and one-sentence OC Mode

One-sentence OC Singleton mode and one-sentence OC Mode

Create a new header file and define the following macro:

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// Implementation of. h file#define SingletonH(methodName) + (instancetype)shared##methodName; // Implementation of the. m file# If _ has_feature (objc_arc) // It is ARC#define SingletonM(methodName) \static id _instace = nil; \+ (id)allocWithZone:(struct _NSZone *)zone \{ \if (_instace == nil) { \static dispatch_once_t onceToken; \dispatch_once(&onceToken, ^{ \_instace = [super allocWithZone:zone]; \}); \} \return _instace; \} \\- (id)init \{ \static dispatch_once_t onceToken; \dispatch_once(&onceToken, ^{ \_instace = [super init]; \}); \return _instace; \} \\+ (instancetype)shared##methodName \{ \return [[self alloc] init]; \} \+ (id)copyWithZone:(struct _NSZone *)zone \{ \return _instace; \} \\+ (id)mutableCopyWithZone:(struct _NSZone *)zone \{ \return _instace; \} # Else // not ARC #define SingletonM(methodName) \static id _instace = nil; \+ (id)allocWithZone:(struct _NSZone *)zone \{ \if (_instace == nil) { \static dispatch_once_t onceToken; \dispatch_once(&onceToken, ^{ \_instace = [super allocWithZone:zone]; \}); \} \return _instace; \} \\- (id)init \{ \static dispatch_once_t onceToken; \dispatch_once(&onceToken, ^{ \_instace = [super init]; \}); \return _instace; \} \\+ (instancetype)shared##methodName \{ \return [[self alloc] init]; \} \\- (oneway void)release \{ \\} \\- (id)retain \{ \return self; \} \\- (NSUInteger)retainCount \{ \return 1; \} \+ (id)copyWithZone:(struct _NSZone *)zone \{ \    return _instace; \} \ \+ (id)mutableCopyWithZone:(struct _NSZone *)zone \{ \    return _instace; \} #endif

Then

. H file write SingletonH (MyMethodName)

. M file write SingletonM (MyMethodName)

Done!