objective-c - 对象值在方法之间传递

Question

如果我创建一个属性，例如:

@property(nonatomic, strong) NSString *RSSIvalue;

然后我合成它:

@synthesize RSSIvalue;

然后我可以将其定义为一种方法中的某些内容吗:

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
RSSIvalue = [NSString stringWithFormat:@"%ld", (long)RSSI.integerValue];
}

然后使用我在另一个方法中定义的值:

- (IBAction)setNValueAt1meter:(id)sender
{
self.nValue1m.text = RSSIvalue;
}

Answer 1

可以，只要你的订单正确。

但是在我看来，RSSIvalue 应该存储为在演示期间格式化的数字:

@property(nonatomic, strong) NSNumber *RSSIvalue;

- (void)centralManager:(CBCentralManager *)central
 didDiscoverPeripheral:(CBPeripheral *)peripheral
     advertisementData:(NSDictionary *)advertisementData
                  RSSI:(NSNumber *)RSSI
{
    self.RSSIvalue = RSSI;
}

- (IBAction)setNValueAt1meter:(id)sender
{
    self.nValue1m.text = [NSString stringWithFormat:@"%@", self.RSSIvalue];
    // same as this, only more expensive:
    // self.nValue1m.text = [self.RSSIvalue description];

}

注意self.RSSIvalue的使用。您甚至可以将其设置为long，这样更简单。