Question

我正在尝试从字典中向数组添加对象。在其他部分我收到此错误

发送到不可变对象的变异方法＆＃39;

NSMutableDictionary *selectedDict = [NSMutableDictionary new];
    [selectedDict setObject:editedLineItem forKey:@"Text"];
    [selectedDict setObject:@"fa-check" forKey:@"IconClass"];
    NSMutableArray *tagListDictionary = [NSMutableArray new];
    [tagListDictionary addObject:selectedTagsArray];
    LineItemsStorage *linestorage = [LineItemsStorage sharedManager];
    if(![linestorage.packagesArray valueForKey:@"Id"])
    {
        [linestorage.selectedLineItemsAndTagsArray addObject:selectedDict];
    }
    else{        [[linestorage.packagesArray valueForKey:@"LineItems"]addObject:[NSMutableArray arrayWithObject:selectedDict]];
    }

- [ NSCFArray insertObject：atIndex：]：发送到不可变对象的变异方法＆＃39; ***第一次抛出调用堆栈：（ 0 CoreFoundation 0x00000001154a1d85 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x0000000114f15deb objc_exception_throw + 48 2 CoreFoundation 0x00000001154a1cbd + [NSException raise：format：] + 205 3 CoreFoundation 0x0000000115497b0a - [__ NSCFArray insertObject：atIndex：] + 106 4 FlatPebble 0x000000010f276014 - [LineItemViewController okayAction] + 836 5 UIKit 0x0000000113809a8d - [UIApplication sendAction：to：from：forEvent：] + 92 6 UIKit 0x000000011397ce67 - [UIControl sendAction：to：forEvent：] + 67 7 UIKit 0x000000011397d143 - [UIControl _sendActionsForEvents：withEvent：] + 327 8 UIKit 0x000000011397c263 - [UIControl touchesEnded：withEvent：] + 601 9 UIKit 0x000000011387c99f - [UIWindow _sendTouchesForEvent：] + 835 10 UIKit 0x000000011387d6d4 - [UIWindow sendEvent：] + 865 11 UIKit 0x0000000113828dc6 - [UIApplication sendEvent：] + 263 12 UIKit 0x0000000113802553 _UIApplicationHandleEventQueue + 6660 13 CoreFoundation 0x00000001153c7301 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 14 CoreFoundation 0x00000001153bd22c __CFRunLoopDoSources0 + 556 15 CoreFoundation 0x00000001153bc6e3 __CFRunLoopRun + 867 16 CoreFoundation 0x00000001153bc0f8 CFRunLoopRunSpecific + 488 17 GraphicsServices 0x0000000116e5cad2 GSEventRunModal + 161 18 UIKit 0x0000000113807f09 UIApplicationMain + 171 19 *********** 0x000000010f348c2f main + 111 20 libdyld.dylib 0x0000000115d9992d start + 1 ）

Answer 1

使用此代码

 NSMutableDictionary *selectedDict = [[NSMutableDictionary new]mutableCopy];
    [selectedDict setObject:editedLineItem forKey:@"Text"];
    [selectedDict setObject:@"fa-check" forKey:@"IconClass"];
    NSMutableArray *tagListDictionary = [[NSMutableArray new]mutableCopy];
    [tagListDictionary addObject:selectedTagsArray];
    LineItemsStorage *linestorage = [LineItemsStorage sharedManager];
    if(![linestorage.packagesArray valueForKey:@"Id"])
    {
        [linestorage.selectedLineItemsAndTagsArray addObject:selectedDict];
    }
    else{        [[linestorage.packagesArray valueForKey:@"LineItems"]addObject:[NSMutableArray arrayWithObject:selectedDict]];
    }

Answer 2

假设您的LineItems包含一个数组，该数组包含一个或多个具有[[linestorage.packagesArray valueForKey:@"LineItems"]addObject:[NSMutableArray arrayWithObject:selectedDict]]属性的对象（恰好也是一个数组）；您的问题在这里：

NSArray* packagesLineItems = [linestorage.packagesArray valueForKey:@"LineItems"]; NSMutableArray* selected = [NSMutableArray arrayWithObject:selectedDict]; [packagesLineItems addObject:selected];

打破它相当于：

education_bachelor_summary<- education_bachelor %>%
  group_by(title_mapped) %>%
  summarise(n=n()) %>%
  mutate(perc = n / sum(n)) %>%
  arrange(desc(n)) %>%
  mutate(label=(str_c(title_mapped, "-", as.character(percent(perc)), sep=" ")))


midpoint <-sum(education_bachelor_summary$perc) - cumsum(education_bachelor_summary$perc) + education_bachelor_summary$perc/2

ggplot(education_bachelor_summary, aes(x = "", y=perc, fill = factor(title_mapped))) +
  geom_bar(width = 1, stat = "identity") +
  scale_y_continuous(breaks=midpoint, labels=education_bachelor_summary$label) +
  scale_fill_brewer(palette = "Blues", direction = -1) +
  labs(fill="Bachelor/ Vordiplom",x=NULL,y=NULL,title="",caption="") +
  coord_polar(theta = "y", start=0) +
  theme(axis.ticks = element_blank(), panel.grid  = element_blank(), axis.line = element_blank(), strip.background = element_blank(), panel.background = element_blank())

所以您的问题是valueForKey的返回类型（在数组上调用时），或者您要对其执行的操作。

变异方法发送到不可变对象＆＃39;

2 个答案: