+ (instancetype)sharedService {
static id instance;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [self new];
});
return instance;
}
用id而不是实际的类名，用dispatch_once保证只调用一次，用[self new]创建对象，也不用实际的类名。
This topic created in 3983 days ago, the information mentioned may be changed or developed.
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