对UITableView的数组进行排序
对UITableView的数组进行排序
提问于 2014-04-01 14:19:15
我有一个为我的UITableView准备数据的函数：
- (void) SearchFromMyPosition {
TitleLabelSort = [[NSMutableArray alloc] init];
DistanceLabelSort = [[NSMutableArray alloc] init];
TagValueSort = [[NSMutableArray alloc] init];
DistanceUnitSort = [[NSMutableArray alloc] init];
LatArraySort = [[NSMutableArray alloc] init];
LngArraySort = [[NSMutableArray alloc] init];
// loading
[activityIndicatorObject startAnimating];
NSNumber *latNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:@"api_lat"];
NSNumber *lngNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:@"api_lng"];
double lat1 = [latNr1 doubleValue];
double lng1 = [lngNr1 doubleValue];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSArray *array = [APIConnection GetDataFromUrlAuth];
dispatch_async(dispatch_get_main_queue(), ^{
for (NSString *item in array) {
NSArray *coords = [[[array valueForKey:item] valueForKey:@"location"] componentsSeparatedByString:@"|"];
double lat2 = [[coords objectAtIndex:0] doubleValue];
double lng2 = [[coords objectAtIndex:1] doubleValue];
CLLocation *oldLocation = [[CLLocation alloc] initWithLatitude:lat1 longitude:lng1];
CLLocation *newLocation = [[CLLocation alloc] initWithLatitude:lat2 longitude:lng2];
CLLocationDistance meters = [newLocation distanceFromLocation:oldLocation];
[LatArraySort addObject:[NSString stringWithFormat:@"%f",lat2]];
[LngArraySort addObject:[NSString stringWithFormat:@"%f",lng2]];
[TitleLabelSort addObject:[[array valueForKey:item] valueForKey:@"name"]];
[DistanceLabelSort addObject:[NSString stringWithFormat:@"%f",meters]];
[TagValueSort addObject:item];
[self.myTableView reloadData];
[activityIndicatorObject stopAnimating];
}
});
});
}这是可行的，但我需要按DistanceLabelSort对结果进行排序，我使用下面的函数对CoreData结果进行排序，效果很好：
- (void) SetTableData {
TitleLabel = [[NSMutableArray alloc] init];
DistanceLabel = [[NSMutableArray alloc] init];
TagValue = [[NSMutableArray alloc] init];
DistanceUnit = [[NSMutableArray alloc] init];
LatArray = [[NSMutableArray alloc] init];
LngArray = [[NSMutableArray alloc] init];
// sorting
NSArray *sortedArray = [DistanceLabelSort sortedArrayUsingComparator:^(NSString *str1, NSString *str2) {
return [str1 compare:str2 options:NSNumericSearch];
}];
NSString *sortIdentStr = [[NSString alloc] init];
unsigned long sortIdent;
NSMutableArray *arrayUnit = [[NSMutableArray alloc] init];
for (int i = 0; i < sortedArray.count; i++) {
sortIdentStr = [sortedArray objectAtIndex:i];
sortIdent = [DistanceLabel indexOfObject:sortIdentStr];
arrayUnit = [self unitStr:sortIdentStr];
[TitleLabel addObject:[TitleLabelSort objectAtIndex:sortIdent]];
[TagValue addObject:[TagValueSort objectAtIndex:sortIdent]];
[LatArray addObject:[LatArraySort objectAtIndex:sortIdent]];
[LngArray addObject:[LngArraySort objectAtIndex:sortIdent]];
[DistanceLabel addObject:[arrayUnit objectAtIndex:0]];
[DistanceUnit addObject:[arrayUnit objectAtIndex:1]];
[self.myTableView reloadData];
[activityIndicatorObject stopAnimating];
}
}但是如果我尝试使用它来对来自外部api函数的数据进行排序，那么在我从外部api获得结果之前，SetTableData就已经完成了。
Stack Overflow用户
发布于 2014-04-01 19:47:19
最后我找到了解决方案，也许这会对其他人有帮助：
我添加了检查任务是否完成的功能：
- (void)SearchFromMyPositionWithSuccess:(void (^)(void))successHandler failure:(void (^)(void))failureHandler {
TitleLabelSort = [[NSMutableArray alloc] init];
DistanceLabelSort = [[NSMutableArray alloc] init];
TagValueSort = [[NSMutableArray alloc] init];
DistanceUnitSort = [[NSMutableArray alloc] init];
LatArraySort = [[NSMutableArray alloc] init];
LngArraySort = [[NSMutableArray alloc] init];
// loading
[activityIndicatorObject startAnimating];
NSNumber *latNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:@"api_lat"];
NSNumber *lngNr1 = [[NSUserDefaults standardUserDefaults] valueForKey:@"api_lng"];
double lat1 = [latNr1 doubleValue];
double lng1 = [lngNr1 doubleValue];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSArray *array = [APIConnection GetDataFromUrlAuth];
dispatch_async(dispatch_get_main_queue(), ^{
int i = 0;
for (NSString *item in array) {
i++;
NSArray *coords = [[[array valueForKey:item] valueForKey:@"location"] componentsSeparatedByString:@"|"];
double lat2 = [[coords objectAtIndex:0] doubleValue];
double lng2 = [[coords objectAtIndex:1] doubleValue];
CLLocation *oldLocation = [[CLLocation alloc] initWithLatitude:lat1 longitude:lng1];
CLLocation *newLocation = [[CLLocation alloc] initWithLatitude:lat2 longitude:lng2];
CLLocationDistance meters = [newLocation distanceFromLocation:oldLocation];
[LatArraySort addObject:[NSString stringWithFormat:@"%f",lat2]];
[LngArraySort addObject:[NSString stringWithFormat:@"%f",lng2]];
[TitleLabelSort addObject:[[array valueForKey:item] valueForKey:@"name"]];
[DistanceLabelSort addObject:[NSString stringWithFormat:@"%f",meters]];
[TagValueSort addObject:item];
if (i == array.count) {
successHandler();
}
[activityIndicatorObject stopAnimating];
}
});
});
}并等待此函数成功：
-(void) SearchFromMyPosition {
[self SearchFromMyPositionWithSuccess: ^{
[self SetTableData];
NSLog(@"success");
} failure:^{
NSLog(@"failure");
}];
}这解决了我的问题:)
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/22778249
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