[英]How to sort a NSArray which contains NSDictionary?
我有一个像这样的plist:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>highscores</key>
<array>
<dict>
<key>highscoreInSeconds</key>
<string>9</string>
<key>levelName</key>
<string>1</string>
<key>name</key>
<string>Black</string>
</dict>
<dict>
<key>highscoreInSeconds</key>
<string>12</string>
<key>levelName</key>
<string>1</string>
<key>name</key>
<string>Black</string>
</dict>
</array>
</dict>
</plist>
现在我想通过highscoreInSeconds
进行排序。
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *plistDirectory = [paths objectAtIndex:0];
NSString* fullPath = [plistDirectory stringByAppendingPathComponent:@"data.plist"];
NSMutableDictionary* pData = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];
NSMutableArray* highscores = [pData valueForKey:@"highscores"];
我现在该如何排序?
非常感谢你! :)
祝你今天愉快。
PS:最后看起来应该是这样的:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>highscores</key>
<array>
<dict>
<key>highscoreInSeconds</key>
<string>12</string>
<key>levelName</key>
<string>1</string>
<key>name</key>
<string>Black</string>
</dict>
<dict>
<key>highscoreInSeconds</key>
<string>9</string>
<key>levelName</key>
<string>1</string>
<key>name</key>
<string>Black</string>
</dict>
</array>
</dict>
</plist>
你不需要说我怎么写一个我知道的plist。
我用这个:
NSArray* sorted = [highscoreAll sortedArrayUsingComparator:(NSComparator)^(NSDictionary *item1, NSDictionary *item2) {
NSString *score1 = [item1 objectForKey:@"highscoreInSeconds"];
NSString *score2 = [item2 objectForKey:@"highscoreInSeconds"];
return [score1 compare:score2 options:NSNumericSearch];
}];
它起作用了。
您可以使用
- (NSArray *)sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))comparator context:(void *)context
实现一个函数,说明在排序值中哪两个字典更大。
NSInteger intSort(id value1, id value2, void *context)
{
id v1 = [value1 valueforkey:@""];//give required key
id v2 = [value2 valueforkey:@""];//give required key
if (v1 < v2) // do comparison based on the data type
return NSOrderedAscending;
else if (v1 > v2)
return NSOrderedDescending;
else
return NSOrderedSame;
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *plistDirectory = [paths objectAtIndex:0];
NSString* fullPath = [plistDirectory stringByAppendingPathComponent:@"data.plist"];
NSMutableDictionary* pData = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath];
NSMutableArray* highscores = [pData valueForKey:@"highscores"];
现在使用...您可以NSSortDescriptor
使用NSSortDescriptor
并且非常容易使用。 只提供您想要对数组进行排序的键。
NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"highscores" ascending:YES];
[highscores sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];
[descriptor release];
希望对你而言,
NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"interest" ascending:YES];
[stories sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];
recent = [stories copy];
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