我很长时间使用Magical Record进行异步UITableViewController。 在我的表中，我有两种类型的子类自定义UITableViewCell。 其中一个，包含一个大图像。 在表中可以有很多这类消息。
这使得我的桌子滚动非常糟糕。
我很乐意帮忙，因为我被困住了，我的tableView看起来很糟糕。
这是我的代码：
MainTableViewController：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
id typeOfCell;
CoreDataPhotoRecord *photoDetails;
if (tableView == self.searchDisplayController.searchResultsTableView) {
photoDetails = self.searchResults[indexPath.row];
}
else {
photoDetails = [HumanResponse allAcceptedRecords][indexPath.row];
}
switch (photoDetails.message.type.integerValue) {
case NORMAL_MESSAGE:
{
MessageTableViewCell *cell = (MessageTableViewCell *)[tableView dequeueReusableCellWithIdentifier:kMessageCellID];
if (!cell) {
cell = (MessageTableViewCell *)[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kMessageCellID];
}
typeOfCell = cell;
break;
}
case GENERAL_MESSAGE:
case TOTAL_MESSAGE:
case SHARE_MESSAGE:
{
ShareTableViewCell *cell = (ShareTableViewCell *)[tableView dequeueReusableCellWithIdentifier:kShareCellID];
if (!cell) {
cell = (ShareTableViewCell *)[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kShareCellID];
}
typeOfCell = cell;
break;
}
}
typeOfCell = [self configureCell:typeOfCell
tableView:tableView
indexPath:indexPath
photoDetails:photoDetails];
return typeOfCell;
}
- (id)configureCell:(id)cell
tableView:(UITableView *)tableView
indexPath:(NSIndexPath *)indexPath
photoDetails:(CoreDataPhotoRecord *)photoDetails
{
// Set data with fail-safe
if ([cell respondsToSelector:@selector(setParentView:)]) {
[cell setParentView:self];
}
if ([cell respondsToSelector:@selector(setIndexPath:)]) {
[cell setIndexPath:indexPath];
}
if ([cell respondsToSelector:@selector(setTag:)]) {
[cell setTag:indexPath.row];
}
if ([cell respondsToSelector:@selector(configureWithMessage:)]) {
[cell configureWithMessage:photoDetails];
}
if (photoDetails.message.type.integerValue == NORMAL_MESSAGE) {
if ([cell respondsToSelector:@selector(setImageViewRepresentative:)]) {
[cell imageViewRepresentative].layer.masksToBounds = YES;
[cell imageViewRepresentative].layer.borderColor = [UIColor whiteColor].CGColor;
[cell imageViewRepresentative].layer.borderWidth = 1;
[cell imageViewRepresentative].layer.cornerRadius = 20;
}
}
if (tableView.isEditing) {
[cell setSelectionStyle:UITableViewCellSelectionStyleDefault];
} else {
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
}
/* if (photoDetails.message.type.integerValue == NORMAL_MESSAGE) {
switch (photoDetails.state.integerValue) {
case PhotoRecordStateDownloaded: {
//
break;
}
case PhotoRecordStateFailed: {
//
break;
}
case PhotoRecordStateNew: {
if (!tableView.dragging && !tableView.decelerating) {
[self.asyncOperations startOperationsForPhotoRecord:photoDetails indexPath:indexPath];
}
break;
}
}
} */
return cell;
}
ShareTableViewCell：
- (void)configureWithMessage:(CoreDataPhotoRecord *)photoDetails
{
self.photoDetails = photoDetails;
__weak typeof(self) weakSelf = self;
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:self.photoDetails.message.imageURL];
urlRequest.cachePolicy = NSURLRequestReturnCacheDataElseLoad;
UIImage *placeholderImage = [UIImage imageNamed:@"default_246.jpg"];
[[UIImageView new] setImageWithURLRequest:urlRequest
placeholderImage:placeholderImage
messageID:self.photoDetails.message.message_id
success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image)
{
if (image) {
if (![weakSelf.photoDetails.image isEqualToData:UIImagePNGRepresentation(weakSelf.backgroundButton.currentBackgroundImage)]) {
if ([NSThread isMainThread]) {
[weakSelf.backgroundButton setBackgroundImage:image forState:UIControlStateNormal];
}
else {
dispatch_async(dispatch_get_main_queue(), ^{
[weakSelf.backgroundButton setBackgroundImage:image forState:UIControlStateNormal];
});
}
}
}
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error)
{
NSLog(@"%s, failure: %@", __PRETTY_FUNCTION__, error.localizedDescription);
if ([NSThread isMainThread]) {
[weakSelf.backgroundButton setBackgroundImage:placeholderImage forState:UIControlStateNormal];
}
else {
dispatch_async(dispatch_get_main_queue(), ^{
[weakSelf.backgroundButton setBackgroundImage:placeholderImage forState:UIControlStateNormal];
});
}
}];
self.labelRepresentativeName.text = HRLocalizedString(@"app_name");
if (self.photoDetails.message.textColor.integerValue == DARK_GRAY_COLOR) {
self.labelRepresentativeName.textColor = [UIColor darkGrayColor];
self.labelText.textColor = [UIColor darkGrayColor];
self.labelText2.textColor = [UIColor darkGrayColor];
self.labelTime.textColor = [UIColor darkGrayColor];
[self.btnDelete setBackgroundImage:[UIImage imageNamed:@"trash_gray.png"] forState:UIControlStateNormal];
[self.btnDelete setBackgroundImage:[UIImage imageNamed:@"trash_gray_pressed.png"] forState:UIControlStateHighlighted];
}
else {
self.labelRepresentativeName.textColor = [UIColor whiteColor];
self.labelText.textColor = [UIColor whiteColor];
self.labelText2.textColor = [UIColor whiteColor];
self.labelTime.textColor = [UIColor whiteColor];
[self.btnDelete setBackgroundImage:[UIImage imageNamed:@"trash.png"] forState:UIControlStateNormal];
[self.btnDelete setBackgroundImage:[UIImage imageNamed:@"trash_pressed.png"] forState:UIControlStateHighlighted];
}
self.mySecretMessage = self.photoDetails.message.text;
HRCalendarUnit calendarUnit = [Utilities relativeDateFormDate:[Utilities dateFromString:self.photoDetails.message.date]];
if (calendarUnit == HRCalendarUnitToday) {
self.labelTime.text = HRLocalizedString(@"today");
}
else if (calendarUnit == HRCalendarUnitYesterday) {
self.labelTime.text = HRLocalizedString(@"yesterday");
}
else {
self.labelTime.text = [self getCeanDate:self.photoDetails.message.date];
}
self.labelText.text = self.mySecretMessage;
}
的UIImageView +异步：
- (void)setImageWithURLRequest:(NSURLRequest *)urlRequest
placeholderImage:(UIImage *)placeholderImage
messageID:(NSString *)message_id
success:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image))success
failure:(void (^)(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error))failure
{
CoreDataPhotoRecord *photoDetails = [self imageExists:message_id];
if (photoDetails.state.integerValue == PhotoRecordStateNew || photoDetails.state.integerValue == PhotoRecordStateFailed) {
if (placeholderImage) self.image = placeholderImage;
__block NSURLResponse *urlResponse;
__block NSData *data;
__block NSError *connectionError;
[appDelegate.imageQueue addOperationWithBlock:^{
data = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&urlResponse error:&connectionError];
if (data) {
if (success) {
appDelegate.sharedCache[photoDetails.message.imageURL] = [UIImage imageWithData:data];
[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) {
CoreDataPhotoRecord *newPhotoDetails = [photoDetails MR_inContext:localContext];
if (newPhotoDetails) {
newPhotoDetails.image = data;
newPhotoDetails.state = [NSNumber numberWithInteger:PhotoRecordStateDownloaded];
}
}];
success(urlRequest, (NSHTTPURLResponse *)urlResponse, appDelegate.sharedCache[photoDetails.message.imageURL]);
// success(urlRequest, (NSHTTPURLResponse *)urlResponse, [UIImage imageWithData:data]);
}
}
else {
[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) {
CoreDataPhotoRecord *newPhotoDetails = [photoDetails MR_inContext:localContext];
if (newPhotoDetails) {
newPhotoDetails.state = [NSNumber numberWithInteger:PhotoRecordStateFailed];
}
}];
if (failure) {
failure(urlRequest, (NSHTTPURLResponse *)urlResponse, connectionError);
}
}
}];
}
else {
// if (success) {
// success(urlRequest, nil, appDelegate.sharedCache[photoDetails.message.imageURL]);
// }
if (success) success(urlRequest, nil, [UIImage imageWithData:photoDetails.image]);
}
}
我正在尝试这么多方式（而且我知道它很糟糕）但是没有任何东西能让我获得很好的快速滚动感。