Question

我正在将BEMSimpleLineGraph库集成到我的Objective-C iPhone应用程序中，我在将Core数据中的int值添加到NSMutableArray时遇到了麻烦，后来在同一个类中检索了不同的方法。

以下是我用来填充数组的代码：

// Get those points from Core Data into my arrays
for (int i = 0; i < countInArray; i++) {

    NSManagedObject *device = [self.tapTestsConducted objectAtIndex:i];

    int leftInt, rightInt;

    leftInt = [[device valueForKey:@"leftNumber"] intValue];
    rightInt = [[device valueForKey:@"rightNumber"] intValue];

    [_leftArray addObject: [NSNumber numberWithInt:leftInt]];
    [_rightArray addObject: [NSNumber numberWithInt:rightInt]];

    NSDate *date = [device valueForKey:@"date"];
    [self.dateArray addObject: date];

    // For testing - Did the correct data get into the arrays?

    NSLog(@"%d", leftInt);
    NSLog(@"%d", rightInt);
    NSLog(@"%@", date);
}

以下是用于查找图形y值的方法：

- (CGFloat)lineGraph:(BEMSimpleLineGraphView *)graph valueForPointAtIndex:(NSInteger)index {
NSNumber *anumber = [_leftArray objectAtIndex:index];
int anInt = [anumber intValue];

NSLog(@"%d", anInt);
return anInt;
}

第一部分中的NSLog输出正确的数据，但第二种方法中的NSLog输出全部为0。

非常感谢任何建议或意见！

编辑：这是运行时的NSLog输出：

2016-09-11 22:30:04.072 CNS Test CD[16805:849994] 5 tests conducted
2016-09-11 22:30:04.072 CNS Test CD[16805:849994] 12
2016-09-11 22:30:04.072 CNS Test CD[16805:849994] 0
2016-09-11 22:30:04.072 CNS Test CD[16805:849994] 2016-08-31 23:49:12 +0000
2016-09-11 22:30:04.072 CNS Test CD[16805:849994] 20
2016-09-11 22:30:04.072 CNS Test CD[16805:849994] 0
2016-09-11 22:30:04.072 CNS Test CD[16805:849994] 2016-09-02 23:31:44 +0000
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 0
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 17
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 2016-09-02 23:32:12 +0000
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 12
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 0
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 2016-09-05 19:13:19 +0000
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 13
2016-09-11 22:30:04.073 CNS Test CD[16805:849994] 0
2016-09-11 22:30:04.074 CNS Test CD[16805:849994] 2016-09-05 19:13:55 +0000
2016-09-11 22:30:05.949 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.950 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.951 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.955 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.955 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.955 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.956 CNS Test CD[16805:849994] 0
2016-09-11 22:30:05.956 CNS Test CD[16805:849994] 0

Answer 1

我已经在我的.h文件中正确声明了我的NSMutableArrays：

@property (strong, nonatomic) NSMutableArray *leftArray;
@property (strong, nonatomic) NSMutableArray *rightArray;
@property (strong, nonatomic) NSMutableArray *dateArray;

我没做过，在我做完之后修复了问题，就是用alloc init初始化我的arras。我把这些行放在for循环之前。

self.leftArray = [[NSMutableArray alloc] init];
self.rightArray = [[NSMutableArray alloc] init];
self.dateArray = [[NSMutableArray alloc] init];

使用int值填充NSMutableArray，然后重新执行它们

1 个答案: