在CABasicAnimation.fromValue中,我想将CGPoint转换为“类”,所以我使用了NSValue valueWithPoint,但在设备模式或模拟器中无法工作……如果在设备或模拟器中,则需要使用NSMakePoint或CGPointMake。
发布于 2009-04-21 15:24:28
发布于 2012-06-20 01:52:29
@ashcatch的答案非常有用,但考虑到那些来自加法的方法复制值,当原生NSValue方法存储指针时!下面是我检查的代码:
CGPoint point = CGPointMake(2, 4);
NSValue *val = [NSValue valueWithCGPoint:point];
point.x = 10;
CGPoint newPoint = [val CGPointValue];这里是newPoint.x = 2; point.x = 10
CGPoint point = CGPointMake(2, 4);
NSValue *val = [NSValue valueWithPointer:&point];
point.x = 10;
CGPoint *newPoint = [val pointerValue];这里是newPoint.x = 10; point.x = 10
发布于 2015-04-25 13:47:33
在Swift中,您可以像这样更改值:
var pointValueare = CGPointMake(30,30)
NSValue(CGPoint: pointValueare)https://stackoverflow.com/questions/772958
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