cocoa - 使用 NSCoder 编码 CGPoint 结构

Question

如何使用 NSCoder 编码和解码 CGPoint 结构？

Answer 1

编码:

CGPoint point = /* point from somewhere */
NSValue *pointValue = [NSValue value:&point withObjCType:@encode(CGPoint)];
[coder encodeObject:pointValue forKey:@"point"];

解码:

NSValue *decodedValue = [decoder decodeObjectForKey:@"point"];
CGPoint point;
[decodedValue getValue:&point];