打印控件子视图

- (void)explode:(id)aView level:(int)aLevel {
         for (int i = 0; i < aLevel; i++)
                   printf("-");
         printf("%s:%s/n",[[[aView class] description] UTF8String],[[[aView superclass] description] UTF8String]);
        
         for(UIView *subview in [aView subviews])
                   [self explode:subview level:(aLevel + 1)];
}

打印控件子视图