iOS开发——NSArray中的字典排序

　　手头上碰到一个项目，需要给数组中的字典中的一个字段排序，想了想，干脆再字典中增加一个字段，用来记录需要排序字段的第一个字符，用它来作为比较的对象，进行排序。

- (void)viewDidLoad {

[super viewDidLoad];

NSArray *arr = @[@{@"sortKey":@"54"},@{@"sortKey":@"67"},@{@"sortKey":@"78"},@{@"sortKey":@"87"},@{@"sortKey":@"32"},@{@"sortKey":@"43"},@{@"sortKey":@""},@{@"sortKey":@"f"},@{@"sortKey":@"12"},@{@"sortKey":@"43"},@{@"sortKey":@"56"},@{@"sortKey":@"567"},@{@"sortKey":@"435"}];

NSArray *sarr = [arr sortedArrayUsingFunction:compare context:NULL];

NSLog(@"sarr:%@",sarr);

}

NSComparisonResult compare(NSDictionary *firstDict, NSDictionary *secondDict, void *context) {

if ([[firstDict objectForKey:@"sortKey"] intValue] < [[secondDict objectForKey:@"sortKey"] intValue])

return NSOrderedAscending;

else if ([[firstDict objectForKey:@"sortKey"] intValue] > [[secondDict objectForKey:@"sortKey"] intValue])

return NSOrderedDescending;

else

return NSOrderedSame;

}