iOS单例 宏定义
#define singleton_interface(className) + (className *)shared##className; // @implementation #define singleton_implementation(className) static className *_instance; + (id)allocWithZone:(NSZone *)zone { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instance = [super allocWithZone:zone]; }); return _instance; } + (className *)shared##className { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instance = [[self alloc] init]; }); return _instance; }
用法:
@interface AccountTool : NSObject singleton_interface(AccountTool) @end
@implementation AccountTool singleton_implementation(AccountTool) @end
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