xcode 按字母顺序对可变数组进行排序
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sorting mutable array in alphabetical order
提问by mrugen
I am having a nsmutable array and in that nearly 50 -60 object having different names ,and can i sort this array in alphabetical order (Is it possible, How?)
我有一个 nsmutable 数组，其中将近 50 -60 个对象具有不同的名称，我可以按字母顺序对这个数组进行排序吗（是否可能，如何？）
回答by TechZen
For a simple sort like this, I like to use sort descriptors.
对于像这样的简单排序，我喜欢使用排序描述符。
Suppose you have an mutable array of objects whose class has a nameNSString property:
假设您有一个可变对象数组，其类具有nameNSString 属性：
NSSortDescriptor *sort=[NSSortDescriptor sortDescriptorWithKey:@"name" ascending:NO];
[myArray sortUsingDescriptors:[NSArray arrayWithObject:sort]];
回答by Jacob Relkin
Absolutely, you can use sortUsingSelector:for this:
当然，您可以使用sortUsingSelector:：
[myArray sortUsingSelector:@selector(compare:)];
If your array has custom objects, then you will need to implement a sorting method on those objects:
如果您的数组有自定义对象，那么您将需要对这些对象实施排序方法：
@implementation myCustomObject
...
-(NSComparisonResult) compare:(myCustomObject*) other {
return [self.name compare:other.name];
}
@end
回答by Joshua Nozzi
TechZen's approach works well, but it would work better if you used NSSortDescriptor's +sortDescriptorWithKey:ascending:selector:, passing "localizedCompare:" as the selector. This way, the sorting is localized to the user's language, which can make a big difference in string comparison.
TechZen 的方法效果很好，但如果您使用 NSSortDescriptor 的 +sortDescriptorWithKey:ascending:selector:，将“localizedCompare:”作为选择器传递，效果会更好。通过这种方式，排序被本地化为用户的语言，这可以在字符串比较中产生很大的不同。
回答by royemi
myArray=[myDict keysSortedByValueUsingSelector:@selector(compare:)];
Simply Worked for me!
简直对我来说有效！
