CGpoint，CGSize，CGRect，NSRange

    NSRange (范围);(location,位置  length，长度;

    NSPoint /CGpoint（点）;

    NSSize /CGSize（大小）

    CGPoint p1 = CGPointZero == CGPointMake(0, 0)代表原点

CGSizeZero == CGSizeMake(0, 0);代表大小为0

    CGRect rec = CGRectMake(0, 0, 10, 10);

    CGRect re = CGRectMake(CGPointMake(<#CGFloat x#>, <#CGFloat y#>), CGSizeMake(<#CGFloat width#>, <#CGFloat height#>))

    //判断两个坐标是否相等

    BOOL b = CGPointEqualToPoint(CGPointMake(10, 10), CGPointMake(10, 10));