我要评论#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface ImagePlay : NSObject<NSCopying>
+ (instancetype)sharedClass;
-(void)test;
@end
NS_ASSUME_NONNULL_END
#import "ImagePlay.h"
static ImagePlay *defaultImagePly = nil;
@implementation ImagePlay
+ (instancetype)sharedClass {
//第一步：静态实例，并初始化
// static CDSharedClass *defaultShared = nil;
//第二部：只分配一次内存
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
defaultImagePly = [[[self class]alloc]init];
});
return defaultImagePly;
}
//第三部：重载allocWithZone方法
+ (instancetype)allocWithZone:(struct _NSZone *)zone {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
defaultImagePly = [super allocWithZone:zone];
});
return defaultImagePly;
}
//第四部：重写copyWithZone
- (id)copyWithZone:(NSZone *)zone {
return defaultImagePly;
}
-(void)test{
NSLog(@"666");
}
@end
本文地址：https://blog.csdn.net/u011224726/article/details/107982704
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