NSArrayM objectAtIndex: index 6 beyond bounds - ios

Question

I am developing iOS application. Value store on Array, but when I run app, its crashes with array index out of bounds. Please Help and Thanks in advance..
Code:
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];
}
Crash Log:
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)

Answer 1

The problem is with your for loop. Array index start with 0 so change your for loop to:
for (int i = 0; i < [_daysOfWeek count]; i++) {
You are using i<=[_daysOfWeek count] that is the reason you are getting index 7 beyond bounds [0 .. 6] crash.
Instead of using for loop you can use for each loop and it easy to implement and it will never cause you index out of bound crash.
for (NSString* str in _daysOfWeek) {
NSLog(#"%#",str);
}

Answer 2

DEEPAK kumar just verify your logic. Your array having 7 values and you are iterating it 8 times. Just change the logic
for (int i = 0; i < [_daysOfWeek count]; i++)
or
use for each loop as Nirav D describes (most optimized way).
Happy coding..

Answer 3

Just changing you for loop logic from i <= [_daysOfWeek count] to i < [_daysOfWeek count] should resolve your problem. However, to avoid mistakes like this in future, I suggest you to use enumerateObjectsUsingBlock method of NSArray. It can be done in the following way:
NSArray *daysOfWeek = [NSArray arrayWithObjects:#"Monday",#"Tuesday",#"Wednesday",#"Thursday",#"Friday",#"Saturday",#"Sunday", nil];
[daysOfWeek enumerateObjectsUsingBlock:^(NSString* _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
}];

Answer 4

Please write :
for (int i = 0; i < [_daysOfWeek count]; i++)
It will help you.