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#5 利用高水位标记基本实现 当用户点击主题进入主题帖子列表时，界面定位到最新未读贴。
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exiaomo committed Jun 22, 2015
1 parent 59347b4 commit 2a06432
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Showing 5 changed files with 101 additions and 79 deletions.
6 changes: 0 additions & 6 deletions ARGO_317_2/General/AllBoardsList/BoardListViewController.h
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Original file line number Diff line number Diff line change
Expand Up @@ -9,17 +9,11 @@
#import "AllBoardListViewController.h"

@interface BoardListViewController : UITableViewController<UITableViewDelegate, UITableViewDataSource>
{
NSArray *boards;
NSInteger *total_topicNumber;
}

@property (nonatomic, strong) NSArray *boards;
@property (nonatomic, strong) NSDictionary *sectionDict;

@property (nonatomic, strong) LoadingCell *loadingCell;
@property (strong, nonatomic) UIRefreshControl *refreshControl;



@end
83 changes: 45 additions & 38 deletions ARGO_317_2/General/Home/PostListViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
// 1. No data.
// 2. List ready.
// 3. Rendering cells in page.
// 4. Scroll to the high water mark

#import "PostListViewController.h"
#import "AddPostViewController.h"
Expand Down Expand Up @@ -60,22 +61,18 @@ - (void)viewDidLoad
-(void) initTopicList {
postTopicList = [[NSMutableArray alloc]init];
[loadingCell loading];
[[DataManager manager] getPostsPerTopicByBoardName:boardName andFile:fileName success:^(NSDictionary *resultDict){
NSLog(@"On getting topic successfully.");
int success=[[resultDict objectForKey:@"success"]intValue];
if (success==1) {
NSArray *data=[resultDict objectForKey:@"data"];
NSLog(@"Dictionary: %@", [data description]);
postList = [NSMutableArray arrayWithCapacity:[data count]];
for (int i=0; i<[data count]; i++) {
if ([data objectAtIndex:i]) {
// init postList before postTopicList to avoid NilException. Should be done in a better way?
[postList addObject:[NSNull null]];
[postTopicList addObject:[data objectAtIndex:i]];
}
[[DataManager manager] getPostsPerTopicByBoardName:boardName andFile:fileName success:^(NSDictionary *resultDict) {
//NSLog(@"On getting topic successfully.");
NSArray *data=[resultDict objectForKey:@"data"];
//NSLog(@"Dictionary: %@", [data description]);
postList = [NSMutableArray arrayWithCapacity:[data count]];
for (int i=0; i<[data count]; i++) {
if ([data objectAtIndex:i]) {
[postList addObject:[NSNull null]];
[postTopicList addObject:[data objectAtIndex:i]];
}
[self loadNextPage];
}
[self loadUntilHighWaterMark];
} failure:^(NSString *data, NSError *error) {
// failed?
NSLog(@"Loading failed.");
Expand All @@ -88,25 +85,29 @@ -(void) initTopicList {
];
}

-(void) loadUntilHighWaterMark {
[loadingCell loading];
int highWaterMark = [[DataManager manager] getHighWaterMark:boardName andFile:fileName];
[self fetchInBatch:0 numberOfPages:highWaterMark/pageSize + 1 didFinished:^{
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:[[DataManager manager] getHighWaterMark:boardName andFile:fileName] inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
}];
}

-(void) loadNextPage {
[loadingCell loading];
[self fetchInBatch:currentPage*pageSize count:pageSize];
[self fetchInBatch:currentPage*pageSize numberOfPages:1 didFinished:nil];
}

//下拉刷新调用的方法
-(void)refreshView:(UIRefreshControl *)refresh
{
-(void)refreshView:(UIRefreshControl *)refresh {
if (refresh.refreshing) {
refresh.attributedTitle = [[NSAttributedString alloc] initWithString:lastUpdated];

[self clear];
[self initTopicList];
[self.tableView reloadData];
}
}

- (void)clear
{
- (void)clear {
[postTopicList removeAllObjects];
[loadingCell loading];
currentPage = 0;
Expand All @@ -132,37 +133,37 @@ - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(N
// for the last row always return loading cell.
return loadingCell.cell;
}

cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

NSDictionary *post = (self.postList)[indexPath.row];
[self composite:cell at:indexPath with:post];
NSLog(@"Returning cell=%@",cell);
[[DataManager manager] setHighWaterMark:boardName andFile:fileName mark:(int)indexPath.row];
//NSLog(@"Returning cell=%@",cell);
return cell;
}

-(void) fetchInBatch:(int) from count:(int) count {
-(void) fetchInBatch:(int) from numberOfPages:(int) num didFinished:(void (^) ())didFinished {
assert(postTopicList.count > 0);
assert(count >= 0);
assert(num >= 0);
__block int counter = 0;
int threshold = MIN(count, (int)postTopicList.count - from);
int threshold = MIN(num*pageSize, (int)postTopicList.count - from);
if (threshold < 0) {
// No more data now.
lastUpdated=[NSString stringWithFormat:@"更新时间 %@", [dateFormatter stringFromDate:[NSDate date]]];
[loadingCell normal];
loadingCell.label.text=[NSString stringWithFormat:@"%@",lastUpdated];
}
NSLog(@"Going to fetch next %d from %d", count, from);
//NSLog(@"Going to fetch next %d from %d", count, from);
for (int i = from; i < from + threshold; ++i) {
NSLog(@"Going to fetch :%@", [postTopicList objectAtIndex:i]);
[[DataManager manager] getPostByBoard:boardName andFile:[postTopicList objectAtIndex:i] success:^(NSDictionary *resultDict) {
NSLog(@"On fetching successfully:%@",[[resultDict objectForKey:@"data"] objectForKey:@"filename"]);
//NSLog(@"Going to fetch :%@", [postTopicList objectAtIndex:i]);
[[DataManager manager] getPostByBoard:boardName andFile:[postTopicList objectAtIndex:i] forceReload:NO success:^(NSDictionary *resultDict) {
//NSLog(@"On fetching successfully:%@",[[resultDict objectForKey:@"data"] objectForKey:@"filename"]);
if ([resultDict objectForKey:@"data"]&&[[resultDict objectForKey:@"data"]isKindOfClass:[NSDictionary class]]) {
self.postList[i]=[resultDict objectForKey:@"data"];
}
++counter;
if(counter == threshold) {
currentPage++;
currentPage+=num;
[loadingCell normal];
if (postTopicList.count <= from + threshold) {
lastUpdated=[NSString stringWithFormat:@"更新时间 %@", [dateFormatter stringFromDate:[NSDate date]]];
Expand All @@ -171,9 +172,10 @@ -(void) fetchInBatch:(int) from count:(int) count {
loadingCell.label.text=[NSString stringWithFormat:@"下面还有%lu贴，轻轻上拉继续看",(unsigned long)postTopicList.count-from-threshold];
}
[self.tableView reloadData];
if (didFinished) didFinished();
}
} failure:^(NSString *data, NSError *error) {
NSLog(@"When fetching failed, data=%@, error=%@", data, error);
NSLog(@"Failed when fetching post, data=%@, error=%@", data, error);
UIAlertView *av = [[UIAlertView alloc]initWithTitle:@"Error" message:@"请退回重新进入或者重新登录后再试试" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[av show];
}];
Expand All @@ -182,7 +184,7 @@ -(void) fetchInBatch:(int) from count:(int) count {

- (void) composite:(UITableViewCell *) cell at:(NSIndexPath *) indexPath
with:(NSDictionary *) data {
NSLog(@"Compositing cell %@ at %@ with %@", cell, indexPath, data);
//NSLog(@"Compositing cell %@ at %@ with %@", cell, indexPath, data);
NSString *authorStr=@"loading...";
NSString *post_timeStr=@"loading...";
NSString *floorStr=[NSString stringWithFormat:@"#%ld",(long)indexPath.row+1];
Expand Down Expand Up @@ -223,7 +225,12 @@ - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL
if(scrollView.contentSize.height - (scrollView.contentOffset.y + scrollView.bounds.size.height - scrollView.contentInset.bottom) <= -REFRESH_HEADER_HEIGHT && scrollView.contentOffset.y > 0) {
//如果是提醒详情，则不需要上拉加载更多
if ([self.navigationItem.title isEqualToString:@"提醒详情"]==NO) {
[self loadNextPage];
if(currentPage*pageSize >= [self.postTopicList count]) {
currentPage--;
[self initTopicList];
} else {
[self loadNextPage];
}
}
}

Expand Down Expand Up @@ -262,10 +269,10 @@ -(CGFloat) getTheHeight:(NSInteger)row {

- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
if(postList&&[postList count]) {
NSLog(@"cell is deletable?!");
//NSLog(@"cell is deletable?!");
return UITableViewCellEditingStyleDelete; //返回此值时,Cell会做出响应显示Delete按键,点击Delete后会调用下面的函数,别给传递UITableViewCellEditingStyleDelete参数
} else {
NSLog(@"cell is non-deletable?!");
//NSLog(@"cell is non-deletable?!");
return UITableViewCellEditingStyleNone; //返回此值时,Cell上不会出现Delete按键,即Cell不做任何响应
}
}
Expand Down Expand Up @@ -409,7 +416,7 @@ - (NSString*) formatReplyingTitle:(NSString*) originalTitle {
}

- (NSString*) formatQuotingContent:(NSString*) originalContent {
NSLog(@"%@", originalContent);
//NSLog(@"%@", originalContent);
NSMutableString* formatedContent = [[NSMutableString alloc] init];
NSArray* array=[originalContent componentsSeparatedByString:@"\n"];
// The first and last line breakers shall be ignored.
Expand Down
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