xcode 对 NSMutuableArray 进行排序
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Sort a NSMutuableArray
提问by pithhelmet
I have a NSMutableArray that is loaded with a inforamtion from a dictionary...
我有一个 NSMutableArray，它加载了字典中的信息......
[self.data removeAllObjects];
NSMutableDictionary *rows = [[NSMutableDictionary alloc] initWithDictionary:[acacheDB.myDataset getRowsForTable:@"sites"]];
self.data = [[NSMutableArray alloc] initWithArray:[rows allValues]];
There are two key value pairs in the rows dictionary.
行字典中有两个键值对。
I need to sort the self.data NSMutableArray in alphabetical order.
我需要按字母顺序对 self.data NSMutableArray 进行排序。
How is this accomplished??
这是怎么实现的？？
thanks
tony
感谢
托尼
回答by Yannick Compernol
If the values are plain strings you can use the following to create a sorted array:
如果值是纯字符串，您可以使用以下内容创建一个排序数组：
NSArray *sorted = [values sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
回答by Regexident
This should do:
这应该做：
[self.data removeAllObjects];
NSArray *values = [[acacheDB.myDataset getRowsForTable:@"sites"] allValues];
NSSortDescriptor *alphaDescriptor = [[NSSortDescriptor alloc] initWithKey:@"DCFProgramName" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)];
NSArray *sortedValues = [values sortedArrayUsingDescriptors:[NSMutableArray arrayWithObjects:alphaDescriptor, nil]];
[alphaDesc release];
[self.data addObjectsFromArray:sortedValues];
- There's no need to clear an
NSMutableArrayif you're replacing it shortly afterwards. - There's no need to create an additional
NSMutableDictionary, if you're not modifying anything in it. - There's no need to create an additional
NSMutableArray, if you could just as well just add the values to the existing one.
NSMutableArray如果您稍后要更换它，则无需清除。NSMutableDictionary如果您不修改其中的任何内容，则无需创建额外的。NSMutableArray如果您可以将值添加到现有的值，则无需创建额外的.
Also: There are some serious memory leaksin your code. (2x alloc + 0x release = 2x leak)
另外：您的代码中存在一些严重的内存泄漏。（2x 分配 + 0x 释放 = 2x 泄漏）
Edit: updated code snippet to reflect OP's update on data structure.
编辑：更新代码片段以反映 OP 对数据结构的更新。
