+ (Instance *)shaer{
static Instance *instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[Instance alloc]init];
});
return instance;
}
+ (Instance *)shaer{
static Instance *instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[Instance alloc]init];
});
return instance;
}
转载于:https://www.cnblogs.com/yang99/p/4775579.html