objective中在背景调用类方法

在下面这段摘录代码中：

/*A ClassName with instanceMethod and ClassMethod  */

-(void)instanceMethod;

+(void)ClassMethod;

/*To call a instance method in background */

ClassName  class1obj = [ClassName alloc] init];

[class1obj performSelectorInBackground:@selector(instanceMethod) withObject:nil];

怎么用performSelectorInBackground在背景中调用ClassMethod？

类本身就是对象，所以只要调用：

[ClassName performSelectorInBackground:@selector(ClassMethod) withObject:nil];

应该就可以

试试这个；

[ClassName performSelectorInBackground:@selector(methodTobeCalled) withObject:nil];

用self代替类的名字也可以：
试试

[self performSelectorInBackground:@selector(methodTobeCalled) withObject:nil];