nsmutablearray

error : 'Attempt to mutate immutable object with appendString:' --

由 删除回忆录丶 提交于 2019-12-07 12:38:12
问题 I am getting an error 'Attempt to mutate immutable object with appendString:' and my code is NSMutableString *resultString= [[NSMutableString alloc]init]; for (NSMutableString *s in self.ArrayValue) { [resultString appendString:s]; NSLog(resultString); } ArrayValue is NSMutableArray. I am not able to understand where is the problem thank you in advance 回答1: As posted, the code you have will not give you the error you describe. Probably, somewhere between allocating resultString and the for

remove object from NSArray

由 烈酒焚心 提交于 2019-12-07 11:41:39
问题 How can I remove an object from a reversed NSArray . Currently I have a NSMutableArray , then I reverse it with NSArray* reversedCalEvents = [[calEvents reverseObjectEnumerator] allObjects]; now I need to remove at item from reversedCalEvents or calEvents and automatically refresh the table the array is displayed in based on conditions. i.e. if(someInt == someOtherInt){ remove object at index 0 } How can I do this? I cannot get it to work. 回答1: You will need a mutable array in order to remove

writeToFile not working with NSDictionary [duplicate]

由 ↘锁芯ラ 提交于 2019-12-07 08:46:15
问题 This question already has answers here : Why NSMutableDictionary don't want write to file? (2 answers) Closed 5 years ago . I looked around other similar questions about this but nothing really worked. I managed to write only one pair (object / key) of the dictionary (e.g.: setObject:itemProperties[0] forKey[0]) on my Plist. But I would like all the objets and keys to be added. I didn't managed so far (return the error). Any help? // Path to Documents Folder NSArray *paths =

【OC】十一、数组对象(NSArray & NSMutableArray)

由 扶醉桌前 提交于 2019-12-07 08:44:13
不可变数组： NSArray 可变数组： NSMutableArray 创建一个不可变数组 简单的创建一个数组 [NSArray arrayWithObjects: @"111",@"222",nil]; 我们可以按顺序列出对象并用逗号隔开，并且最后一个值指定为nil 这时候我们可以使用 arrayWithObjects 方法 我们可以取出数组的值 用objectAtIndex方法 [arr objectAtIndex:0]; 创建一个可变数组 如果我们想要在数组中添加 删除 修改元素 我们可以使用NSMutableArray NSMutableArray *arr = [NSMutableArray array]; 给数组分配容量 NSMutableArray *array= [ NSMutableArray arrayWithCapacity : 20 ]; 在数组末尾添加对象 [array addObject:"Four"]; 删除数组中指定索引处对象 [array removeObjectAtIndex:1]; 快速枚举 for(NSString *string in array) { NSLog(@"string:%@",string); } 来源： oschina 链接： https://my.oschina.net/u/1048271/blog/209005

iPhone: Return NSMutableArray in method while still releasing

由 余生长醉 提交于 2019-12-07 07:34:27
I am trying to understand a little more about memory management. Knowing that I need to release anything that I have init or alloc'ed I am confused about the following: - (NSMutableArray *)getData { NSMutableArray *data = [[NSMutableArray alloc] init]; NSString *first = @"First object"; [data addObject:first]; NSString *second = @"Second object"; [data addObject:second]; return data; } Since I used alloc and init, I know I need to release my data object. But if I add autorelease to the init part or to the return, it crashes when I run the method. What is the correct way to do something like

Sort NSMutableArray with custom objects by another NSMutableArray [duplicate]

由 做~自己de王妃 提交于 2019-12-07 06:25:57
问题 This question already has answers here : How do I sort an NSMutableArray with custom objects in it? (25 answers) Sorting two NSArrays together side by side (4 answers) Closed 6 years ago . I have 2 NSMutableArrays . First array contains custom object intances with property NSString *itemID , second array contains only from NSString objects with same values of itemID , but in another order. I need to sort first array by itemID property of each object, and it should be sorted like second array.

Selectively remove and delete objects from a NSMutableArray in Swift

由 痞子三分冷 提交于 2019-12-07 05:42:13
问题 Basic question. What is the best way to selectively remove and delete items from a mutable Array in Swift? There are options that do NOT seem to be suited for this like calling removeObject inside a for in loop enumeration block and others that appear to work in general like for loop using an index + calling removeObjectAtIndex , even inside the loop for in loop for populating an arrayWithItemsToRemove and then use originalArray. removeObjectsInArray(arrayWithItemsToRemove) using .filter to

Fast Enumeration With an NSMutableArray that holds an NSDictionary

由 99封情书 提交于 2019-12-07 05:23:52
问题 Is it possible to use fast enumeration with an NSArray that contains an NSDictionary? I'm running through some Objective C tutorials, and the following code kicks the console into GDB mode NSMutableArray *myObjects = [NSMutableArray array]; NSArray *theObjects = [NSArray arrayWithObjects:@"easy as 1",@"easy as two", @"Easy as Three"]; NSArray *theKeys = [NSArray arrayWithObjects:@"A",@"B",@"C"]; NSDictionary *theDict = [NSDictionary dictionaryWithObjects:theObjects forKeys:theKeys];

How can I convert NSMutableArray into NSString?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-07 05:04:02
问题 I am trying to convert (or copy?) a NSMutableArray into a NSString . I guess my problem is that I don't really understand the structure of a NSString . After conversion I want to attached it in email body. Here is my code: - (IBAction)sendEmail { NSLog(@"sendEmail"); [textView resignFirstResponder]; [textView1 resignFirstResponder]; if ([MFMailComposeViewController canSendMail]) { // set the sendTo address NSMutableArray *recipients = [[NSMutableArray alloc] initWithCapacity:1]; [recipients

I'm trying to get a UILabel to scroll inside of a UIScrollView but it doesnt scroll

由 情到浓时终转凉″ 提交于 2019-12-07 04:49:55
问题 This is in my .m - (void)viewDidLoad { [super viewDidLoad]; [self.scrollView addSubview:self.contentView]; self.scrollView.contentSize = self.contentView.bounds.size; NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; NSMutableArray *arr = [[NSMutableArray alloc]init]; arr = [Singleton getArray]; NSString *str = [arr componentsJoinedByString:@"\n"]; summaryLabel.text = str; } This is in my .h @interface TotalViewController : UIViewController { UIScrollView *scrollView;
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