将CGPoint转换为NSValue

Question

在CABasicAnimation.fromValue我想要转换CGPoint为"类"所以我使用NSValue valueWithPoint但在设备模式或模拟器一个不工作...需要使用NSMakePoint或CGPointMake如果在设备或模拟器.

Answer 1

还有一个定义函数的UIKit附加NSValue功能

+ (NSValue *)valueWithCGPoint:(CGPoint)point

请参阅iPhone文档

Answer 2

@ashcatch的回答非常有帮助,但考虑那些方法来自添加复制值,当本机NSValue方法存储指针时!这是我的代码检查它:

CGPoint point = CGPointMake(2, 4);
NSValue *val = [NSValue valueWithCGPoint:point];
point.x = 10;
CGPoint newPoint = [val CGPointValue];

这里 newPoint.x = 2; point.x = 10

CGPoint point = CGPointMake(2, 4);
NSValue *val = [NSValue valueWithPointer:&point];
point.x = 10;
CGPoint *newPoint = [val pointerValue];

这里 newPoint.x = 10; point.x = 10