Objective-Cプログラミング:NSValue

+ (NSValue *)valueWithPoint:(NSPoint)point;
+ (NSValue *)valueWithSize:(NSSize)size;
+ (NSValue *)valueWithRect:(NSRect)rect;
+ (NSValue *)valueWithEdgeInsets:(NSEdgeInsets)insets NS_AVAILABLE(10_10, 8_0);

// NSPoint 
NSPoint somePoint = NSMakePoint(100, 100);
NSValue *point = [NSValue valueWithPoint:somePoint];

// CGPoint
NSValue *myPointValue = [NSValue valueWithPoint:CGPointMake(10, 10)];
CGPoint point = [myPointValue pointValue];

//   
NSValue *mySizeValue = [NSValue valueWithSize:CGSizeMake(375, 664)];
CGSize size = [mySizeValue sizeValue];

//     
NSValue *myRectValue = [NSValue valueWithRect:CGRectMake(0, 0, 375, 664)];
CGRect rect = [myRectValue rectValue];

//   
NSValue *myRangeValue = [NSValue valueWithRange:NSMakeRange(0, 10)];
NSRange range = [myRangeValue rangeValue];

//           、  
struct WXpoint {
    float a;
    float b;
};

struct WXpoint p = {10,50};

//  
NSValue *pointvalue1 = [NSValue value:&p
  withObjCType:@encode(struct WXpoint)];

//  
struct WXpoint p2;
[pointvalue1 getValue:&p2];