当我使用作为Singleton属性的NSMutableArray时，向NSMutableArray中添加一些对象。压碎
当我使用作为Singleton属性的NSMutableArray时，向NSMutableArray中添加一些对象。压碎
提问于 2017-03-13 16:10:34
这是我的sampleCode：
-(IBAction)add:(id)sender {
//ShoppingManager sharedManager is a singleton
[[ShoppingManager sharedManager].onlineClassArray addObject:@(1)];
}和ShoppingManager.m中的代码：
//singleton
+ (ShoppingManager *)sharedManager{
static id instance;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[self alloc]init];
});
return instance;
}
- (OnlineClassItemizeArray *)onlineClassArray{
if (!_onlineClassArray) {
_onlineClassArray = [OnlineClassItemizeArray array];
}
return _onlineClassArray;
}还有ShoppingMananger.h：
@interface ShoppingManager : NSObject
@property(nonatomic,strong) OnlineClassItemizeArray * onlineClassArray;
+ (ShoppingManager*)sharedManager;
@end我不知道这些codes.when有什么问题--我在mutableArray中添加了一些对象，它停在了下面一行：(一个完全异常的BreakPoint)
_onlineClassArray = [OnlineClassItemizeArray array];比在这里被碾碎更重要：
DISPATCH_INLINE DISPATCH_ALWAYS_INLINE DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
DISPATCH_SWIFT3_UNAVAILABLE("Use lazily initialized globals instead")
void
_dispatch_once(dispatch_once_t *predicate,
DISPATCH_NOESCAPE dispatch_block_t block)
{
if (DISPATCH_EXPECT(*predicate, ~0l) != ~0l) {
dispatch_once(predicate, block);//<---crushed here
} else {
dispatch_compiler_barrier();
}
DISPATCH_COMPILER_CAN_ASSUME(*predicate == ~0l);
}下面是整个错误信息：
2017-03-14 01:01:36.586 tesr1111[7075:1333259] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSMutableArray initWithCapacity:]: method only defined for abstract class. Define -[OnlineClassItemizeArray initWithCapacity:]!'
*** First throw call stack:
(
0 CoreFoundation 0x00000001100c4d4b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010fb2621e objc_exception_throw + 48
2 CoreFoundation 0x00000001101357df __CFRequireConcreteImplementation + 255
3 CoreFoundation 0x00000001101241a7 -[NSMutableArray initWithCapacity:] + 39
4 tesr1111 0x000000010f54e6d0 -[ShoppingManager init] + 160
5 tesr1111 0x000000010f54e5f1 __32+[ShoppingManager sharedManager]_block_invoke + 65
6 libdispatch.dylib 0x0000000112eda0cd _dispatch_client_callout + 8
7 libdispatch.dylib 0x0000000112ebf1f8 dispatch_once_f + 501
8 tesr1111 0x000000010f54e588 +[ShoppingManager sharedManager] + 136
9 tesr1111 0x000000010f54de9d -[ViewController add:] + 61
10 UIKit 0x00000001104ea8bc -[UIApplication sendAction:to:from:forEvent:] + 83
11 UIKit 0x0000000110670c38 -[UIControl sendAction:to:forEvent:] + 67
12 UIKit 0x0000000110670f51 -[UIControl _sendActionsForEvents:withEvent:] + 444
13 UIKit 0x000000011066fe4d -[UIControl touchesEnded:withEvent:] + 668
14 UIKit 0x0000000110558545 -[UIWindow _sendTouchesForEvent:] + 2747
15 UIKit 0x0000000110559c33 -[UIWindow sendEvent:] + 4011
16 UIKit 0x00000001105069ab -[UIApplication sendEvent:] + 371
17 UIKit 0x0000000120cca481 -[UIApplicationAccessibility sendEvent:] + 93
18 UIKit 0x0000000110cf372d __dispatchPreprocessedEventFromEventQueue + 3248
19 UIKit 0x0000000110cec463 __handleEventQueue + 4879
20 CoreFoundation 0x0000000110069761 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
21 CoreFoundation 0x000000011004e98c __CFRunLoopDoSources0 + 556
22 CoreFoundation 0x000000011004de76 __CFRunLoopRun + 918
23 CoreFoundation 0x000000011004d884 CFRunLoopRunSpecific + 420
24 GraphicsServices 0x0000000113eb0a6f GSEventRunModal + 161
25 UIKit 0x00000001104e8c68 UIApplicationMain + 159
26 tesr1111 0x000000010f54e4df main + 111
27 libdyld.dylib 0x0000000112f2668d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException如果有人能给我任何想法或帮助链接。提前谢谢。
回答 1
Stack Overflow用户
回答已采纳
发布于 2017-03-13 17:28:30
您对NSMutableArray进行了错误的子类划分。它是一个类集群，需要实现的方法最少。
在本例中，您正在调用initWithCapacity:，但尚未重写该方法。或者，更有可能的是，您正在调用一个泛型方法(init)，该方法通过该方法进行调用。
正如例外说的那样：
2017-03-14 01:01:36.586 tesr11117075:1333259终止应用程序由于未命名异常'NSInvalidArgumentException'，原因：‘-NSMutableArray initWithCapacity:：method仅为抽象类定义。定义-OnlineClassItemizeArray initWithCapacity:!'
但是，子类集合类是一个code smell。它几乎从来没有做过。在少数情况下，这是合理的；你的是什么？
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/42768336
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