ios 如何以简单的方式将 CGPoint 对象添加到 NSArray？
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How can I add CGPoint objects to an NSArray the easy way?
提问by Thanks
I have about 50 CGPoint objects that describe something like a "path", and I want to add them to an NSArray. It's going to be a method that will just return the corresponding CGPoint for an given index. I don't want to create 50 variables like p1 = ...; p2 = ..., and so on. Is there an easy way that would let me to define those points "instantly" when initializing the NSArray with objects?
我有大约 50 个 CGPoint 对象描述了“路径”之类的东西，我想将它们添加到 NSArray 中。这将是一个只返回给定索引对应的 CGPoint 的方法。我不想创建 50 个变量，比如 p1 = ...; p2 = ...，依此类推。有没有一种简单的方法可以让我在用对象初始化 NSArray 时“立即”定义这些点？
回答by Jarret Hardie
With UIKitApple added support for CGPoint to NSValue, so you can do:
随着UIKitApple 添加对 CGPoint 的支持NSValue，您可以执行以下操作：
NSArray *points = [NSArray arrayWithObjects:
[NSValue valueWithCGPoint:CGPointMake(5.5, 6.6)],
[NSValue valueWithCGPoint:CGPointMake(7.7, 8.8)],
nil];
List as many [NSValue] instances as you have CGPoint, and end the list in nil. All objects in this structure are auto-released.
列出与 CGPoint 一样多的 [NSValue] 实例，并以 nil 结束列表。此结构中的所有对象都是自动释放的。
On the flip side, when you're pulling the values out of the array:
另一方面，当您从数组中提取值时：
NSValue *val = [points objectAtIndex:0];
CGPoint p = [val CGPointValue];
回答by Tibidabo
I use this:
我用这个：
Create array:
创建数组：
NSArray *myArray = @[[NSValue valueWithCGPoint:CGPointMake(30.0, 150.0)],[NSValue valueWithCGPoint:CGPointMake(41.67, 145.19)]];
Get 1st CGPoint object:
获取第一个 CGPoint 对象：
CGPoint myPoint = [myArray[0] CGPointValue];
回答by GilesDMiddleton
You can also write this in a minimal form of:
您还可以以最小形式编写此内容：
CGPoint myArray[] = { CGPointMake(5.5, 6.6), CGPointMake(7.7, 8.8) };
CGPoint p2 = myArray[1];
回答by Ramin
Have you taken a look at CFMutableArray? That might work better for you.
你看了CFMutableArray吗？那可能更适合你。
