单例模式Singleton-OC版
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代码-.h文件:
#import <Foundation/Foundation.h> @interface Instance : NSObject + (instancetype)sharedInstance; @end
代码-.m文件:
#import "Instance.h" @implementation Instance static id _instance; + (instancetype)allocWithZone:(struct _NSZone *)zone { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instance = [super allocWithZone:zone]; }); return _instance; } + (instancetype)sharedInstance { static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ _instance = [[self alloc] init]; }); return _instance; } - (id)copyWithZone:(NSZone *)zone { return _instance; } - (id)mutableCopyWithZone:(NSZone *)zone { return _instance; } @end
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