Objective-c - NSNumber和NSValue

NSNumber

        //NSNumber创建后可以放入数组或字典中     装箱(boxing)基本类型->对象     取消装箱(unboxing)对象->基本类型
        NSNumber *n1 = [NSNumber numberWithInt:100];
        NSLog(@"n1: %@", n1);
        
        NSMutableArray *arr1 = [NSMutableArray arrayWithCapacity:10];
        [arr1 addObject:n1];
        NSLog(@"arr1: %@", arr1);
        
        NSMutableDictionary *dic1 = [NSMutableDictionary dictionaryWithCapacity:10];
        [dic1 setObject:n1 forKey:@"price"];
        NSLog(@"dic1: %@", dic1);
        
        
        //NSNumber初始化
        NSNumber *n2 = [NSNumber numberWithChar:'a'];
        NSLog(@"n2: %@", n2);
        
        NSNumber *n3 = [NSNumber numberWithBool:false];
        NSLog(@"n3: %@", n3);
        
        NSNumber *n4 = [NSNumber numberWithBool:true];
        NSLog(@"n4: %@", n4);
        
        NSNumber *n5 = [NSNumber numberWithDouble:100.08];
        NSLog(@"n5: %@", n5);
        
        //NSNumber获取
        NSLog(@"n2: %c", [n2 charValue]);
        NSLog(@"n5: %f", [n5 doubleValue]);

 

NSValue

        //NSValue 初始化 valueWithBytes:<#(const void *)#> objCType:<#(const char *)#>   valueWithRange等
        //        NSNumber的子类，添加至数组或字典中，  基本类型(NSRect, NSRange, NSSize, NSPoint -> 对象)
        
        NSMutableArray *array = [NSMutableArray arrayWithCapacity:10];
        
        NSRect rect1 = NSMakeRect(3, -10, 30, 20);
        NSValue *val1 = [NSValue valueWithRect:rect1];
        [array addObject:val1];
        NSLog(@"array: %@", array);
        
        NSRange range1 = NSMakeRange(100, 2000);
        NSValue *val2 = [NSValue valueWithRange:range1];
        [array addObject:val2];
        NSLog(@"array: %@", array);
        
        NSSize size1 = NSMakeSize(10, 10);
        NSValue *val3 = [NSValue valueWithSize:size1];
        [array addObject:val3];
        NSLog(@"array: %@", array);
        
        NSPoint point1 = NSMakePoint(30, 50);
        NSValue *val4 = [NSValue valueWithPoint:point1];
        [array addObject:val4];
        NSLog(@"array: %@", array);
        
        NSRect rect2 = NSMakeRect(0, 0, 100, 300);
        NSValue *val5 = [NSValue valueWithBytes:&rect2 objCType:@encode(NSRect)];
        [array addObject:val5];
        NSLog(@"array: %@", array);
        
        NSPoint point2 = NSMakePoint(15, 90);
        NSValue *val6 = [NSValue valueWithBytes:&point2 objCType:@encode(NSPoint)];
        [array addObject:val6];
        NSLog(@"array: %@", array);
        
        
        //NSValue获取  getValue(要传递得是存储数值的地址)   rectValue, pointValue, sizeValue
        NSValue *v1 = [array objectAtIndex:0];
        NSLog(@"v1: %@", v1);
        NSRect rect3;
        [v1 getValue:&rect3];
        NSLog(@"location: %f, length: %f", rect3.origin.x, rect3.origin.y);
        
        NSRect rect4 = [v1 rectValue];
        NSLog(@"width: %f, height: %f", rect4.size.width, rect4.size.height);