If you have 2 rectangles and you want to find out if one rectangle is inside the other, following code will do:
CGRect b=CGRectMake(40, 50, 240, 150);
CGRect c=CGRectMake(75, 80, 85, 90);
BOOL contains=CGRectContainsRect(b, c);
BOOL contains1=CGRectContainsRect(c, b);
if(contains) NSLog(@"yes"); else NSLog(@"no");
//This will print yes because b contains c.
//NOTE: c should be completely inside b.
if(contains1) NSLog(@"yes");else NSLog(@"no");
//This will print no because b doesn't contain c
If this is not what you were looking for CGRect, try this comprehensive LIST.