Question

如何通过快速枚举枚举此代码中实例的值，它返回数组的地址，而且我觉得这样做有一个简短的方法。

BNRStockHolding *stockHolding = [[BNRStockHolding alloc] init];
[stockHolding setPurchasedSharePrice:2.30];
[stockHolding setCurrentSharePrice:4.50];
[stockHolding setNumberOfShares:40];
float p = [stockHolding purchasedSharePrice];
float c = [stockHolding currentSharePrice];
int n = [stockHolding numberOfShares];
float cost = [stockHolding costInDollars];
float val = [stockHolding valueInDollars];

BNRStockHolding *stockHolding1 = [[BNRStockHolding alloc] init];
[stockHolding setPurchasedSharePrice:12.19];
[stockHolding setCurrentSharePrice:10.56];
[stockHolding setNumberOfShares:90];
float p1 = [stockHolding purchasedSharePrice];
float c1 = [stockHolding currentSharePrice];
int n1 = [stockHolding numberOfShares];
float cost1 = [stockHolding costInDollars];
float val1 = [stockHolding valueInDollars];

BNRStockHolding *stockHolding2 = [[BNRStockHolding alloc] init];
[stockHolding setPurchasedSharePrice:45.10];
[stockHolding setCurrentSharePrice:49.51];
[stockHolding setNumberOfShares:210];
float p2 = [stockHolding purchasedSharePrice];
float c2 = [stockHolding currentSharePrice];
int n2 = [stockHolding numberOfShares];
float cost2 = [stockHolding costInDollars];
float val2 = [stockHolding valueInDollars];

NSMutableArray *threeInstances = [NSMutableArray arrayWithObjects:
    stockHolding, stockHolding1, stockHolding2, nil];

for(BNRStockHolding *d in threeInstances) {
    NSLog(@"%@", d);
}

Answer 1

您是否只想打印物体？如果是这样，请尝试在BNRStockHolding类中定义description方法。像这样：

- (NSString *)description {
    return [NSString stringWithFormat: @"PurchasedSharePrice=%f, CurrentSharePrice=%f", purchasedSharePrice, currentSharePrice];
}

不是打印地址，而是打印出你在那里定义的NSString。

Answer 2

如果您不想修改BNRStockHolding课程，则看起来像这样：

for(BNRStockHolding *d in threeInstances) {
    NSLog(@"Number of shares: %d", [d numberOfShares]);
    NSLog(@"PurchasedSharePrice: %f, CurrentSharePrice: %f", [d 
        purchasedSharePrice], [d currentSharePrice]);
}

NSMutableArray枚举对象

2 个答案: