NSArrayM objectAtIndex:索引 6 超出范围
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【中文标题】NSArrayM objectAtIndex:索引 6 超出范围【英文标题】:NSArrayM objectAtIndex: index 6 beyond bounds 【发布时间】:2016-11-14 06:26:39 【问题描述】:我正在开发 ios 应用程序。数组上的值存储,但是当我运行应用程序时,它的 崩溃 数组索引超出范围。请提前帮助和感谢..
代码:
daysOfWeek = [NSArray arrayWithObjects:@"Monday",@"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday",@"Sunday", nil];
for (int i = 0; i<= [_daysOfWeek count]; i++)
_mondayView=[[UIView alloc]initWithFrame:CGRectMake(45, 300 , 830, 30.0)];
[_mondayView setBackgroundColor:[UIColor colorWithRed:190.0/255.0 green:190.0/255.0 blue:194.0/255.0 alpha:1.0]];
[_weeklyView addSubview:_mondayView];
UILabel *daysLabel = [[UILabel alloc]initWithFrame:CGRectMake(65.0f, 300.0f, 120.0f, 30.0f)];
daysLabel.backgroundColor = [UIColor blueColor];
daysLabel.text = [NSString stringWithFormat:@"%@",[_daysOfWeek objectAtIndex:i]];
[_weeklyView addSubview:daysLabel];
崩溃日志:
2016-11-14 11:48:41.266 FH Harvey[1839:67640] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 7 beyond bounds [0 .. 6]'
*** First throw call stack:
(
0 CoreFoundation 0x000000011101934b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000011065d21e objc_exception_throw + 48
2 CoreFoundation 0x0000000110f53eeb -[__NSArrayI objectAtIndex:] + 155
3 FH Harvey 0x000000010fe1ee62 -[FHWeeklyViewController viewDidLoad] + 1026
4 UIKit 0x00000001115ddc99 -[UIViewController loadViewIfRequired] + 1258
5 UIKit 0x00000001115e4102 -[UIViewController __viewWillAppear:] + 118
6 UIKit 0x000000011160efbf -[UINavigationController _startCustomTransition:] + 1290
7 UIKit 0x000000011161fc34 -[UINavigationController _startDeferredTransitionIfNeeded:] + 697
8 UIKit 0x0000000111620dc7 -[UINavigationController __viewWillLayoutSubviews] + 58
9 UIKit 0x0000000111817d6f -[UILayoutContainerView layoutSubviews] + 223
10 UIKit 0x0000000111500f50 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
11 QuartzCore 0x000000010ffbdcc4 -[CALayer layoutSublayers] + 146
12 QuartzCore 0x000000010ffb1788 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
13 QuartzCore 0x000000010ffb1606 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
14 QuartzCore 0x000000010ff3f680 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
15 QuartzCore 0x000000010ff6c767 _ZN2CA11Transaction6commitEv + 475
16 UIKit 0x0000000111435a97 _UIApplicationFlushRunLoopCATransactionIfTooLate + 206
17 UIKit 0x0000000111c456e0 __handleEventQueue + 5672
18 CoreFoundation 0x0000000110fbe311 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
19 CoreFoundation 0x0000000110fa359c __CFRunLoopDoSources0 + 556
20 CoreFoundation 0x0000000110fa2a86 __CFRunLoopRun + 918
21 CoreFoundation 0x0000000110fa2494 CFRunLoopRunSpecific + 420
22 GraphicsServices 0x00000001163a0a6f GSEventRunModal + 161
23 UIKit 0x000000011143c964 UIApplicationMain + 159
24 FH Harvey 0x000000010fe221bf main + 111
25 libdyld.dylib 0x000000011491368d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
【问题讨论】:
【参考方案1】:问题在于您的 for 循环。数组索引以 0
开头,因此将 for 循环更改为:
for (int i = 0; i < [_daysOfWeek count]; i++)
您正在使用i<=[_daysOfWeek count]
,这就是您遇到index 7 beyond bounds [0 .. 6]
崩溃的原因。
您可以使用for each
循环而不是使用for
循环,它易于实现,并且永远不会导致您的索引越界崩溃。
for (NSString* str in _daysOfWeek)
NSLog(@"%@",str);
【讨论】:
【参考方案2】:DEEPAK kumar 只需验证您的逻辑。你的数组有 7 个值,你正在迭代它 8 次。换个逻辑就行了
for (int i = 0; i < [_daysOfWeek count]; i++)
或
按照 Nirav D 的描述使用for each
循环(最优化的方式)。
编码愉快..
【讨论】:
【参考方案3】:只需将您的 for 循环逻辑从 i <= [_daysOfWeek count]
更改为 i < [_daysOfWeek count]
即可解决您的问题。但是,为了避免以后出现此类错误,我建议您使用NSArray
的enumerateObjectsUsingBlock
方法。可以通过以下方式完成:
NSArray *daysOfWeek = [NSArray arrayWithObjects:@"Monday",@"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday",@"Sunday", nil];
[daysOfWeek enumerateObjectsUsingBlock:^(NSString* _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)
];
【讨论】:
【参考方案4】:请写:
for (int i = 0; i < [_daysOfWeek count]; i++)
它会帮助你。
【讨论】:
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