我目前正在使用名为SKSTableView的自定义/可扩展tableview代码，可在Here
找到问题在于，当我用超过10行填充表格时，UI锁定并且滚动开始非常滞后。我似乎无法追查这个问题，但我认为它与重用细胞有关。
这里有一些希望有用的代码。
-SKSTableView没有改变
-Below是app的实际文件/主屏幕中的实现
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
Bar *bar = [bars objectAtIndex:indexPath.row];
NSArray *friendsAtBar = (NSArray*)bar.friends;
static NSString *cellIdentifier = @"SKSTableViewCell";
SKSTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (!cell){//If no cell, create a new one
cell = [[SKSTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
UIColor *cellBackgroundColor = [UIColor colorWithWhite:( 30/255.0) alpha:1.0];
UIColor *cellTextColor = [UIColor colorWithWhite:0.80 alpha:1.0];
UIImageView *bottomLine = [[UIImageView alloc] initWithFrame:CGRectMake(0, 73, 320, 2)];
bottomLine.backgroundColor = [UIColor colorWithWhite:( 50/255.0) alpha:1.0];
cell.nameLabel.textColor = cellTextColor;
cell.friendsLabel.textColor = cellTextColor;
cell.backgroundColor = cellBackgroundColor;
cell.selectionBanner.backgroundColor = cellBackgroundColor;
[cell addSubview:bottomLine];
[cell.goingButton addTarget:self
action:@selector(goingButtonPressed:)
forControlEvents:UIControlEventTouchUpInside];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.nameLabel.frame = nameStartFrame;
}
if (friendsAtBar != nil && friendsAtBar.count != 0)
cell.isExpandable = YES;
else
cell.isExpandable = NO;
cell.nameLabel.text = bar.name;
//cell.userInteractionEnabled = YES;
if (friendsAtBar.count == 1) // If only 1 friend is going, say friend, if more than 1 friend is going say friends
cell.friendsLabel.text = [NSString stringWithFormat:@"%lu friend going",(unsigned long)friendsAtBar.count];
else if (friendsAtBar.count > 1)
cell.friendsLabel.text = [NSString stringWithFormat:@"%lu friends going",(unsigned long)friendsAtBar.count];
else {
cell.friendsLabel.text = @"";
//cell.nameLabel.frame = CGRectMake(20, 26, 200, 23);
}
//cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.tag = indexPath.row;
[self deselectGoingButton:cell.goingButton];
if ([bar.objectID isEqualToString:[currentUser objectForKey:@"currentBarID"]] && [self under15Hours:[currentUser objectForKey:@"barTimeStamp"]])
{
goingToBarID = bar.objectID; // HERE
//NSLog(@"goingToBarID from cell: %@",goingToBarID);
selectedGoingToButton = cell.goingButton;
[self selectGoingButton:cell.goingButton];
}
cell.goingButton.tag = indexPath.row;
cell.selectionBanner.tag = indexPath.row;
return cell;
}
#pragma mark - TableView - Subrow
- (NSInteger)tableView:(SKSTableView *)tableView numberOfSubRowsAtIndexPath:(NSIndexPath *)indexPath {
if (bars != nil && bars.count != 0) {
Bar *bar = [bars objectAtIndex:indexPath.row];
return bar.friends.count;
}
else
return 0;
} // PARSE IMPACTED
- (UITableViewCell *)tableView:(UITableView *)tableView cellForSubRowAtIndexPath:(NSIndexPath *)indexPath {
//NSMutableDictionary *bar = [bars objectAtIndex:indexPath.row];
Bar *bar = [bars objectAtIndex:indexPath.row];
NSArray *friendsAtBar = (NSArray*)bar.friends;
//UIColor *cellBackgroundColor = [UIColor colorWithWhite:( 20/255.0) alpha:1.0];
//UIColor *cellTextColor = [UIColor colorWithWhite:0.85 alpha:1.0];
UIImageView *bottomLine = [[UIImageView alloc] initWithFrame:CGRectMake(0, 73, 320, 2)];
bottomLine.backgroundColor = [UIColor colorWithWhite:( 50/255.0) alpha:1.0];
static NSString *cellIdentifier = @"FriendsGoingCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
UIView *cellView;
UILabel *nameLabel;
UILabel *usernameLabel;
UIButton *callButton;
UIButton *textButton;
if (!cell){//If no cell, make a new one
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cellView = [self createSubRowView];
nameLabel = [cellView.subviews objectAtIndex:1];
usernameLabel = [cellView.subviews objectAtIndex:2];
usernameLabel.textColor = [UIColor colorWithWhite:0.7 alpha:1.0];
callButton = [cellView.subviews objectAtIndex:3];
textButton = [cellView.subviews objectAtIndex:4];
[cell addSubview:cellView];
[cell addSubview:bottomLine];
}
//cell.backgroundColor = cellBackgroundColor;
cell.tag = 2;
//PFUser *user = [friendsAtBar objectAtIndex:indexPath.subRow-1];
Friend *user = [friendsAtBar objectAtIndex:indexPath.subRow-1];
//UILabel *nameLabel = [cellView.subviews objectAtIndex:1];
//nameLabel.text = [[friendsAtBar objectAtIndex:indexPath.subRow-1] objectForKey:@"username"];
nameLabel.text = [NSString stringWithFormat:@"%@",user.compositeName];
//nameLabel.textColor = cellTextColor;
// UILabel *usernameLabel = [cellView.subviews objectAtIndex:2];
usernameLabel.text = user.userName;
//UIButton *callButton = [cellView.subviews objectAtIndex:3];
callButton.tag = indexPath.subRow-1;
//UIButton *textButton = [cellView.subviews objectAtIndex:4];
textButton.tag = indexPath.subRow-1;
return cell;
}
[self createSubView]
- (UIView *)createSubRowView {
UIView *cellView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, [rowHeight floatValue])];
UIColor *fontColor = [UIColor colorWithWhite:0.85 alpha:1.0];
UIView* bgview = [[UIView alloc] initWithFrame:cellView.frame];
bgview.backgroundColor = [UIColor colorWithWhite:0.15 alpha:1.0];
[cellView addSubview:bgview];
UILabel *nameLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 16, 180, 23)];
nameLabel.textColor = fontColor;
nameLabel.font = [UIFont boldSystemFontOfSize:17];
[cellView addSubview:nameLabel];
UILabel *goingTimeStampLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 41, 180, 16)];
goingTimeStampLabel.textColor = fontColor;
goingTimeStampLabel.font = [UIFont systemFontOfSize:13];
[cellView addSubview:goingTimeStampLabel];
CGFloat x = 200;
CGFloat width = 55;
CGFloat height = [rowHeight floatValue];
CGFloat y = ([rowHeight floatValue] - height)/2;
UIButton *callButton = [[UIButton alloc] initWithFrame:CGRectMake(x, y, width, height)];
UIImage *callIcon = [UIImage imageNamed:@"call.png"];
[callButton setImage:callIcon forState:UIControlStateNormal];
[callButton addTarget:self
action:@selector(clickedCallButton:)
forControlEvents:UIControlEventTouchUpInside];
[cellView addSubview:callButton];
UIButton *textButton = [[UIButton alloc] initWithFrame:CGRectMake(x+width, y, width, height)];
UIImage *textIcon = [UIImage imageNamed:@"text.png"];
[textButton setImage:textIcon forState:UIControlStateNormal];
[textButton addTarget:self
action:@selector(clickedTextButton:)
forControlEvents:UIControlEventTouchUpInside];
[cellView addSubview:textButton];
return cellView;
}
SKSTableView.m
#import "SKSTableView.h"
#import "SKSTableViewCell.h"
#import "SKSTableViewCellIndicator.h"
#import <objc/runtime.h>
#pragma mark - NSArray (SKSTableView)
@interface NSMutableArray (SKSTableView)
- (void)initiateObjectsForCapacity:(NSInteger)numItems;
@end
@implementation NSMutableArray (SKSTableView)
- (void)initiateObjectsForCapacity:(NSInteger)numItems
{
for (NSInteger index = [self count]; index < numItems; index++) {
NSMutableArray *array = [NSMutableArray array];
[self addObject:array];
}
}
@end
#pragma mark - SKSTableView
@interface SKSTableView () <UITableViewDataSource, UITableViewDelegate>
@property (nonatomic, strong) NSMutableArray *expandedIndexPaths;
@property (nonatomic, strong) NSMutableDictionary *expandableCells;
@end
@implementation SKSTableView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
_shouldExpandOnlyOneCell = NO;
}
return self;
}
- (void)setSKSTableViewDelegate:(id<SKSTableViewDelegate>)SKSTableViewDelegate
{
self.dataSource = self;
self.delegate = self;
[self setSeparatorColor:[UIColor colorWithRed:236.0/255.0 green:236.0/255.0 blue:236.0/255.0 alpha:1.0]];
if (SKSTableViewDelegate)
_SKSTableViewDelegate = SKSTableViewDelegate;
}
- (void)setSeparatorColor:(UIColor *)separatorColor
{
[super setSeparatorColor:separatorColor];
[SKSTableViewCellIndicator setIndicatorColor:separatorColor];
}
- (NSMutableArray *)expandedIndexPaths
{
if (!_expandedIndexPaths)
_expandedIndexPaths = [NSMutableArray array];
return _expandedIndexPaths;
}
- (NSMutableDictionary *)expandableCells
{
if (!_expandableCells)
_expandableCells = [NSMutableDictionary dictionary];
return _expandableCells;
}
#pragma mark - UITableViewDataSource
#pragma mark - Required
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [_SKSTableViewDelegate tableView:tableView numberOfRowsInSection:section] + [[[self expandedIndexPaths] objectAtIndex:section] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (![self.expandedIndexPaths[indexPath.section] containsObject:indexPath]) {
NSIndexPath *tempIndexPath = [self correspondingIndexPathForRowAtIndexPath:indexPath];
SKSTableViewCell *cell = (SKSTableViewCell *)[_SKSTableViewDelegate tableView:tableView cellForRowAtIndexPath:tempIndexPath];
if ([[self.expandableCells allKeys] containsObject:tempIndexPath])
[cell setIsExpanded:[[self.expandableCells objectForKey:tempIndexPath] boolValue]];
[cell setSeparatorInset:UIEdgeInsetsZero];
if (cell.isExpandable) {
[self.expandableCells setObject:[NSNumber numberWithBool:[cell isExpanded]]
forKey:indexPath];
UIButton *expandableButton = (UIButton *)cell.accessoryView;
[expandableButton addTarget:tableView
action:@selector(expandableButtonTouched:event:)
forControlEvents:UIControlEventTouchUpInside];
if (cell.isExpanded) {
cell.accessoryView.transform = CGAffineTransformMakeRotation(M_PI);
} else {
if ([cell containsIndicatorView])
[cell removeIndicatorView];
}
} else {
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
[cell removeIndicatorView];
cell.accessoryView = nil;
}
return cell;
} else {
NSIndexPath *indexPathForSubrow = [self correspondingIndexPathForSubRowAtIndexPath:indexPath];
UITableViewCell *cell = [_SKSTableViewDelegate tableView:(SKSTableView *)tableView cellForSubRowAtIndexPath:indexPathForSubrow];
cell.backgroundView = nil;
cell.backgroundColor = [self separatorColor];
cell.indentationLevel = 2;
return cell;
}
}
#pragma mark - Optional
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
if ([_SKSTableViewDelegate respondsToSelector:@selector(numberOfSectionsInTableView:)]) {
NSInteger numberOfSections = [_SKSTableViewDelegate numberOfSectionsInTableView:tableView];
if ([self.expandedIndexPaths count] != numberOfSections)
[self.expandedIndexPaths initiateObjectsForCapacity:numberOfSections];
return numberOfSections;
}
return 1;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if ([_SKSTableViewDelegate respondsToSelector:@selector(tableView:titleForHeaderInSection:)])
return [_SKSTableViewDelegate tableView:tableView titleForHeaderInSection:section];
return nil;
}
#pragma mark - UITableViewDelegate
#pragma mark - Optional
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([_SKSTableViewDelegate respondsToSelector:@selector(tableView:didSelectRowAtIndexPath:)])
[_SKSTableViewDelegate tableView:tableView didSelectRowAtIndexPath:indexPath];
if ([_SKSTableViewDelegate respondsToSelector:@selector(tableView:didDeselectRowAtIndexPath:)])
[_SKSTableViewDelegate tableView:tableView didDeselectRowAtIndexPath:indexPath];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
SKSTableViewCell *cell = (SKSTableViewCell *)[tableView cellForRowAtIndexPath:indexPath];
if ([cell isKindOfClass:[SKSTableViewCell class]] && cell.isExpandable) {
cell.isExpanded = !cell.isExpanded;
NSIndexPath *_indexPath = indexPath;
if (cell.isExpanded && self.shouldExpandOnlyOneCell) {
_indexPath = [self correspondingIndexPathForRowAtIndexPath:indexPath];
[self collapseCurrentlyExpandedIndexPaths];
}
NSInteger numberOfSubRows = [self numberOfSubRowsAtIndexPath:_indexPath];
NSMutableArray *indexPaths = [NSMutableArray array];
NSInteger row = _indexPath.row;
NSInteger section = _indexPath.section;
for (NSInteger index = 1; index <= numberOfSubRows; index++) {
NSIndexPath *expIndexPath = [NSIndexPath indexPathForRow:row+index inSection:section];
[indexPaths addObject:expIndexPath];
}
if (cell.isExpanded) {
[self setIsExpanded:YES forCellAtIndexPath:_indexPath];
[self insertExpandedIndexPaths:indexPaths forSection:_indexPath.section];
} else {
[self setIsExpanded:NO forCellAtIndexPath:_indexPath];
[self removeExpandedIndexPaths:indexPaths forSection:_indexPath.section];
}
[self accessoryViewAnimationForCell:cell];
}
}
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
if ([_SKSTableViewDelegate respondsToSelector:@selector(tableView:accessoryButtonTappedForRowWithIndexPath:)])
[_SKSTableViewDelegate tableView:tableView accessoryButtonTappedForRowWithIndexPath:indexPath];
[self.delegate tableView:tableView didSelectRowAtIndexPath:indexPath];
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
CGFloat height = 0;
if ([_SKSTableViewDelegate respondsToSelector:@selector(tableView:heightForHeaderInSection:)])
height = [_SKSTableViewDelegate tableView:tableView heightForHeaderInSection:section];
return height;
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UIView *view = [[UIView alloc] init];
if ([_SKSTableViewDelegate respondsToSelector:@selector(tableView:viewForHeaderInSection:)])
view = [_SKSTableViewDelegate tableView:tableView viewForHeaderInSection:section];
return view;
}
#pragma mark - SKSTableViewUtils
- (IBAction)expandableButtonTouched:(id)sender event:(id)event
{
NSSet *touches = [event allTouches];
UITouch *touch = [touches anyObject];
CGPoint currentTouchPosition = [touch locationInView:self];
NSIndexPath *indexPath = [self indexPathForRowAtPoint:currentTouchPosition];
if (indexPath)
[self tableView:self accessoryButtonTappedForRowWithIndexPath:indexPath];
}
- (NSInteger)numberOfSubRowsAtIndexPath:(NSIndexPath *)indexPath
{
return [_SKSTableViewDelegate tableView:self numberOfSubRowsAtIndexPath:[self correspondingIndexPathForRowAtIndexPath:indexPath]];
}
- (NSIndexPath *)correspondingIndexPathForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSInteger index = 0;
NSInteger row = 0;
while (index < indexPath.row) {
NSIndexPath *tempIndexPath = [self correspondingIndexPathForRowAtIndexPath:[NSIndexPath indexPathForRow:index inSection:indexPath.section]];
BOOL isExpanded = [[self.expandableCells allKeys] containsObject:tempIndexPath] ? [[self.expandableCells objectForKey:tempIndexPath] boolValue] : NO;
if (isExpanded) {
NSInteger numberOfExpandedRows = [_SKSTableViewDelegate tableView:self numberOfSubRowsAtIndexPath:tempIndexPath];
index += (numberOfExpandedRows + 1);
} else
index++;
row++;
}
return [NSIndexPath indexPathForRow:row inSection:indexPath.section];
}
- (NSIndexPath *)correspondingIndexPathForSubRowAtIndexPath:(NSIndexPath *)indexPath
{
NSInteger index = 0;
NSInteger row = 0;
NSInteger subrow = 0;
while (1) {
NSIndexPath *tempIndexPath = [self correspondingIndexPathForRowAtIndexPath:[NSIndexPath indexPathForRow:index inSection:indexPath.section]];
BOOL isExpanded = [[self.expandableCells allKeys] containsObject:tempIndexPath] ? [[self.expandableCells objectForKey:tempIndexPath] boolValue] : NO;
if (isExpanded) {
NSInteger numberOfExpandedRows = [_SKSTableViewDelegate tableView:self numberOfSubRowsAtIndexPath:tempIndexPath];
if ((indexPath.row - index) <= numberOfExpandedRows) {
subrow = indexPath.row - index;
break;
}
index += (numberOfExpandedRows + 1);
} else
index++;
row++;
}
return [NSIndexPath indexPathForSubRow:subrow inRow:row inSection:indexPath.section];
}
- (void)setIsExpanded:(BOOL)isExpanded forCellAtIndexPath:(NSIndexPath *)indexPath
{
NSIndexPath *correspondingIndexPath = [self correspondingIndexPathForRowAtIndexPath:indexPath];
[self.expandableCells setObject:[NSNumber numberWithBool:isExpanded] forKey:correspondingIndexPath];
}
- (void)insertExpandedIndexPaths:(NSArray *)indexPaths forSection:(NSInteger)section
{
NSIndexPath *firstIndexPathToExpand = indexPaths[0];
NSIndexPath *firstIndexPathExpanded = nil;
if ([self.expandedIndexPaths[section] count] > 0) firstIndexPathExpanded = self.expandedIndexPaths[section][0];
__block NSMutableArray *array = [NSMutableArray array];
if (firstIndexPathExpanded && firstIndexPathToExpand.section == firstIndexPathExpanded.section && firstIndexPathToExpand.row < firstIndexPathExpanded.row) {
[self.expandedIndexPaths[section] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSIndexPath *updated = [NSIndexPath indexPathForRow:([obj row] + [indexPaths count])
inSection:[obj section]];
[array addObject:updated];
}];
[array addObjectsFromArray:indexPaths];
self.expandedIndexPaths[section] = array;
} else {
[self.expandedIndexPaths[section] addObjectsFromArray:indexPaths];
}
[self sortExpandedIndexPathsForSection:section];
// Reload TableView
[self insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationTop];
}
- (void)removeExpandedIndexPaths:(NSArray *)indexPaths forSection:(NSInteger)section
{
NSUInteger index = [self.expandedIndexPaths[section] indexOfObject:indexPaths[0]];
[self.expandedIndexPaths[section] removeObjectsInArray:indexPaths];
if (index == 0) {
__block NSMutableArray *array = [NSMutableArray array];
[self.expandedIndexPaths[section] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSIndexPath *updated = [NSIndexPath indexPathForRow:([obj row] - [indexPaths count])
inSection:[obj section]];
[array addObject:updated];
}];
self.expandedIndexPaths[section] = array;
}
[self sortExpandedIndexPathsForSection:section];
// Reload Tableview
[self deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationTop];
}
- (void)collapseCurrentlyExpandedIndexPaths
{
NSArray *expandedCells = [self.expandableCells allKeysForObject:[NSNumber numberWithBool:YES]];
if (expandedCells.count > 0) {
NSIndexPath *indexPath = [expandedCells firstObject];
[self.expandableCells setObject:[NSNumber numberWithBool:NO] forKey:indexPath];
[self removeExpandedIndexPaths:[self.expandedIndexPaths[indexPath.section] copy] forSection:indexPath.section];
SKSTableViewCell *cell = (SKSTableViewCell *)[self cellForRowAtIndexPath:indexPath];
cell.isExpanded = NO;
[self accessoryViewAnimationForCell:cell];
}
}
- (void)sortExpandedIndexPathsForSection:(NSInteger)section
{
[self.expandedIndexPaths[section] sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
if ([obj1 section] < [obj2 section])
return (NSComparisonResult)NSOrderedAscending;
else if ([obj1 section] > [obj2 section])
return (NSComparisonResult)NSOrderedDescending;
else {
if ([obj1 row] < [obj2 row])
return (NSComparisonResult)NSOrderedAscending;
else
return (NSComparisonResult)NSOrderedDescending;
}
}];
}
- (void)accessoryViewAnimationForCell:(SKSTableViewCell *)cell
{
__block SKSTableViewCell *_cell = cell;
[UIView animateWithDuration:0.2 animations:^{
if (_cell.isExpanded) {
_cell.accessoryView.transform = CGAffineTransformMakeRotation(M_PI);
} else {
_cell.accessoryView.transform = CGAffineTransformMakeRotation(0);
}
} completion:^(BOOL finished) {
if (!_cell.isExpanded)
[_cell removeIndicatorView];
}];
}
@end
#pragma mark - NSIndexPath (SKSTableView)
static void *SubRowObjectKey;
@implementation NSIndexPath (SKSTableView)
@dynamic subRow;
- (NSInteger)subRow
{
id subRowObj = objc_getAssociatedObject(self, SubRowObjectKey);
return [subRowObj integerValue];
}
- (void)setSubRow:(NSInteger)subRow
{
id subRowObj = [NSNumber numberWithInteger:subRow];
objc_setAssociatedObject(self, SubRowObjectKey, subRowObj, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
+ (NSIndexPath *)indexPathForSubRow:(NSInteger)subrow inRow:(NSInteger)row inSection:(NSInteger)section
{
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:section];
indexPath.subRow = subrow;
return indexPath;
}
@end