iOS判断一个类是否存在

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    Class JSONSerialization = NSClassFromString(@"NSJSONSerialization");
    
    if (JSONSerialization) {
        NSLog(@"NSJSONSerialization exist!");
    }
    else
    {
        NSLog(@"NSJSONSerialization not exist!");
    }
    
    JSONSerialization = NSClassFromString(@"JSONSerialization");
    
    if (JSONSerialization) {
        NSLog(@"JSONSerialization exist!");
    }
    else
    {
        NSLog(@"JSONSerialization not exist!");
    }