ios 如何从 CGPoint 和 CGSize 创建 CGRect？
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How do I create a CGRect from a CGPoint and CGSize?
提问by inorganik
I need to create a frame for a UIImageViewfrom a varying collection of CGSizeand CGPoint, both values will always be different depending on user's choices. So how can I make a CGRectform a CGPointand a CGSize? Thank you in advance.
我需要UIImageView从不同的CGSizeand集合中为 a 创建一个框架，CGPoint根据用户的选择，这两个值总是不同的。所以，我怎样才能使一个CGRect形式CGPoint和CGSize？先感谢您。
回答by Jim
Two different options for Objective-C:
Objective-C 的两个不同选项：
CGRect aRect = CGRectMake(aPoint.x, aPoint.y, aSize.width, aSize.height);
CGRect aRect = { aPoint, aSize };
Swift 3:
斯威夫特 3：
let aRect = CGRect(origin: aPoint, size: aSize)
回答by coco
Building on the most excellent answer from @Jim, one can also construct a CGPoint and a CGSize using this method. So these are also valid ways to make a CGRect:
基于@Jim 的最佳答案，您还可以使用此方法构建 CGPoint 和 CGSize。因此，这些也都是有效的方法来进行的CGRect：
CGRect aRect = { {aPoint.x, aPoint.y}, aSize };
CGrect aRect = { aPoint, {aSize.width, aSize.height} };
CGRect aRect = { {aPoint.x, aPoint.y}, {aSize.width, aSize.height} };
回答by rooster117
CGRectMake(yourPoint.x, yourPoint.y, yourSize.width, yourSize.height);
回答by Nikolay Shubenkov
you can use some sugar syntax. For example:
你可以使用一些糖语法。例如：
This is something like construction block you can use for more readable code:
这类似于构造块，您可以将其用于更具可读性的代码：
CGRect rect = ({
CGRect customCreationRect
//make some calculations for each dimention
customCreationRect.origin.x = CGRectGetMidX(yourFrame);
customCreationRect.origin.y = CGRectGetMaxY(someOtherFrame);
customCreationRect.size.width = CGRectGetHeight(yetAnotherFrame);
customCreationRect.size.height = 400;
//By just me some variable in the end this line will
//be assigned to the rect va
customCreationRect;
)}
