CGRectMake & CGSizeMake

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CGFloat: 浮点值的基本类型
CGPoint: 表示一个二维坐标系中的点
CGSize: 表示一个矩形的宽度和高度
CGRect: 表示一个矩形的位置和大小

CGFloat ten=10.0f;
CGPoint point = CGPointMake(0.0f, 0.0f);
CGSize size = CGSizeMake(10.0f, 10.0f);
CGRect rect = CGRectMake(point.x, point.y, size.width, size.height);//pointx和point y表示坐标位置，如果是0，0表示在坐标原点，size.width和size.height表示矩形的大小

灵活运用的例子：

- (void) logRects
    {
        CGFloat
            x      = 10.0,
            y      = 20.0,
            width  = 50.0,
            height = 60.0;

        CGPoint point = {x, y};
        CGSize  size  = {width, height};

        CGRect  rect1 = {1, 3, size};
        CGRect  rect2 = {point, size};
        CGRect  rect3 = {point, size.width, size.height};

            //using designated (named) initialisers
        CGRect  rect4 = {.origin.x=3, .origin.y=5, .size = {100,100}};

            //with designated initialisers, order doesn‘t matter
        CGRect  rect5 = {.size=size, .origin.x=3, .origin.y=5};

        NSLog (@"rect1 %@",NSStringFromCGRect(rect1));
        NSLog (@"rect2 %@",NSStringFromCGRect(rect2));
        NSLog (@"rect3 %@",NSStringFromCGRect(rect3));
        NSLog (@"rect4 %@",NSStringFromCGRect(rect4));
        NSLog (@"rect5 %@",NSStringFromCGRect(rect5));
    }

CGRectMake & CGSizeMake

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原文地址：http://www.cnblogs.com/wenios/p/4809129.html