对象替换了数组中的现有对象，而不是添加

Question

这是我的密码：

NSMutableArray *ratings = [[NSMutableArray alloc] init];
    NSMutableDictionary *eachRating = [[NSMutableDictionary alloc] init];

    for (UIView *subview in self.rateServiceView.subviews) {

        if ([subview isKindOfClass:[RSTapRateView class]]) {

            RSTapRateView *rs = (RSTapRateView *)subview;
            [eachRating setObject:rs.rateId forKey:@"iRatingId"];
            [eachRating setObject:[NSNumber numberWithInt:rs.rating] forKey:@"iRate"];

            [ratings addObject:eachRating];

        }

    }

而不是得到这些值：

{
        iRate = 1;
        iRatingId = 1;
    },
        {
        iRate = 5;
        iRatingId = 2;
    },
        {
        iRate = 2;
        iRatingId = 3;
    }

我得到了这些价值：

{
        iRate = 2;
        iRatingId = 3;
    },
        {
        iRate = 2;
        iRatingId = 3;
    },
        {
        iRate = 2;
        iRatingId = 3;
    }

当我记录每次迭代的结果时，最后一个对象将替换所有现有的对象，并为自己添加一个新的对象。

Answer 1

移动这一行：

    NSMutableDictionary *eachRating = [[NSMutableDictionary alloc] init];

下面是，在下面，这一行：

    for (UIView *subview in self.rateServiceView.subviews) {

这样，您将创建一个新的"eachRating“字典，并将其添加到"ratings”数组中。

Answer 2

是的，这是因为您为同一键分配了不同的值，因此新值取代了该键的旧值。

因此，将代码更改为：

  NSMutableArray *ratings = [[NSMutableArray alloc] init];
    for (UIView *subview in self.rateServiceView.subviews){

        if ([subview isKindOfClass:[RSTapRateView class]]) {

            NSMutableDictionary *eachRating = [[NSMutableDictionary alloc] init];


            RSTapRateView *rs = (RSTapRateView *)subview;
            [eachRating setObject:rs.rateId forKey:@"iRatingId"];
            [eachRating setObject:[NSNumber numberWithInt:rs.rating] forKey:@"iRate"];

            [ratings addObject:eachRating];

        }

    }

Answer 3

如果您不需要在这个循环之后进一步修改单个字典，您可以这样编写它，使其更加现代化和紧凑：

NSMutableArray *ratings = [[NSMutableArray alloc] init];

for (UIView *subview in self.rateServiceView.subviews) {

    if ([subview isKindOfClass:[RSTapRateView class]]) {

        RSTapRateView *rs = (RSTapRateView *)subview;
        [ratings addObject:@{@"iRatingId":rs.rateId, @"iRate":@(rs.rating)}];

    }

}