我的UITableView内部有动态的行数，行数高度因极端数量而异。当我向上和向下滚动时，我总是认识到一点点＆＃34;跳跃＆＃34;或者＆＃34;滞后＆＃34;。我的所有数据都来自我的服务器。
这是我创建一个自定义单元格的示例：
static NSString *BLOCKPHONE = @"BLOCKPHONE_ID";
- (void)viewDidLoad
{
[super viewDidLoad];
[self.tableView registerClass:[GTBlockPhoneNumberView class] forCellReuseIdentifier:BLOCKPHONE];
self.blockDictionary = [[NSMutableDictionary alloc]initWithObjectsAndKeys:BLOCKPHONE,[NSNumber numberWithInt:BLOCK_PHONE], nil];
self.tableView.rowHeight = UITableViewAutomaticDimension;
}
我的代表：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//Put my Data from my Server into my "Model" GFBlock
GFBlock *block = [self.node.blocks objectAtIndex:indexPath.row];
//Each Cell has its own CellIdentifier
NSString *cellIdentifier = [self.blockDictionary objectForKey:[NSNumber numberWithInteger:block.blockTypeId]];
//Check for reusability
GTBlockCell *cell = [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell == nil)
{
//If Cell is nil create the Interface for a new BLockCell with the specific Identifier
cell = [[GTAppController sharedInstance] createInterfaceForCell:block withCellIdentifier:cellIdentifier];
}
//Fill the Interface of the Cell with Data
[[GTAppController sharedInstance] fillInterfaceWithData:block forCell:(GTBlockCell *)cell];
[cell setNeedsUpdateConstraints];
[cell updateConstraintsIfNeeded];
return cell;
}
//My row Heights can vary by extreme amounts so i cannot use a static Cell height, so i use `UITableViewAutomaticDimension`
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewAutomaticDimension;
}
为我的手机创建界面：
- (GTBlockCell *)createInterfaceForCell:(GFBlock *)block withCellIdentifier:(NSString *)identifier{
//Load dynamically the correct Cell with the correct Class Name
NSString* className = [self.interfacesDict objectForKey:NSStringFromBlockType(block.blockTypeId)];
Class c = NSClassFromString(className);
//Initialize new Cell with Identifier
GTBlockCell* instance = [(GTBlockCell *)[c alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
return instance;
}
使用数据填充特定单元格：
- (GTBlockCell *)fillInterfaceWithData:(GFBlock *)block forCell:(GTBlockCell *)cell {
//Fill Interface for Cell (Cell gets Reused)
return [cell initWithBlock:block];
}
至少我的UITableViewCell：
@implementation GTBlockPhoneNumberView
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier];
if (self) {
self.button = [GTButton new];
self.button.translatesAutoresizingMaskIntoConstraints = NO;
self.button.layer.borderColor = [[UIColor colorWithRed:148/255.0f green:187/255.0f blue:12/255.0f alpha:1.0f]CGColor];
self.button.layer.borderWidth = 1.0f;
self.phoneImage = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"phone.png"]];
self.phoneImage.translatesAutoresizingMaskIntoConstraints = NO;
self.phoneContainerView = [UIView new];
self.phoneContainerView.backgroundColor = [UIColor colorWithRed:148/255.0f green:187/255.0f blue:12/255.0f alpha:1.0f];
self.phoneContainerView.translatesAutoresizingMaskIntoConstraints = NO;
self.headLineLabel = [[GTLabel alloc]init];
self.headLineLabel.translatesAutoresizingMaskIntoConstraints = NO;
self.headLineLabel.numberOfLines = 2;
self.headLineLabel.font = [UIFont fontWithName:@"Arial-BoldMT" size:16];
self.phoneLabel = [[GTLabel alloc]init];
self.phoneLabel.translatesAutoresizingMaskIntoConstraints = NO;
self.phoneLabel.numberOfLines = 1;
self.phoneLabel.font = [UIFont fontWithName:@"Arial" size:14];
[self.contentView addSubview:self.button];
[self.button addSubview:self.phoneContainerView];
[self.phoneContainerView addSubview:self.phoneImage];
[self.button addSubview:self.headLineLabel];
[self.button addSubview:self.phoneLabel];
}
return self;
}
- (id)initWithBlock:(GFBlock *)block {
self = [super initWithBlock:block];
if (self) {
for (GFBlockPhoneNumberItem* item in block.values)
{
if([item.phoneHeadline isKindOfClass:[NSNull class]] || item.phoneHeadline.length == 0)
{
self.headLineLabel.text = NSLocalizedString(@"cd_call", nil);
} else {
self.headLineLabel.text = item.phoneHeadline;
}
if([item.phoneNumber isKindOfClass:[NSNull class]] || item.phoneNumber.length == 0)
{
[self.phoneLabel removeFromSuperview];
} else {
self.phoneLabel.text = item.phoneNumber;
}
}
}
return self;
}
- (void)updateConstraints
{
if (!self.didSetupConstraints)
{
NSDictionary *viewsDictionary = @{@"button":self.button, @"phoneContainerView":self.phoneContainerView, @"phoneImage":self.phoneImage, @"headLineLabel":self.headLineLabel, @"phoneLabel":self.phoneLabel};
NSDictionary *metrics = @{@"vSpacing":@10, @"hSpacing":@10};
[self.button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[button(==70)]"
options:0
metrics:metrics
views:viewsDictionary]];
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5@999-[button]-0-|"
options:0
metrics:metrics
views:viewsDictionary]];
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-hSpacing-[button]-hSpacing-|"
options:0
metrics:metrics
views:viewsDictionary]];
[self.button addConstraint:[NSLayoutConstraint constraintWithItem:self.phoneContainerView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self.button
attribute:NSLayoutAttributeHeight
multiplier:1.0
constant:0.0]];
[self.button addConstraint:[NSLayoutConstraint constraintWithItem:self.phoneContainerView
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:self.button
attribute:NSLayoutAttributeHeight
multiplier:1.0
constant:0.0]];
[self.button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[phoneContainerView]"
options:0
metrics:metrics
views:viewsDictionary]];
[self.button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[phoneContainerView]-0-|"
options:0
metrics:metrics
views:viewsDictionary]];
[self.phoneContainerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[phoneImage]-10-|"
options:0
metrics:metrics
views:viewsDictionary]];
[self.phoneContainerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[phoneImage]-10-|"
options:0
metrics:metrics
views:viewsDictionary]];
[self.button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[headLineLabel]-2-[phoneLabel]"
options:0
metrics:metrics
views:viewsDictionary]];
[self.button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[phoneContainerView]-5-[headLineLabel]-5-|"
options:0
metrics:metrics
views:viewsDictionary]];
[self.button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[phoneLabel]-5-|"
options:0
metrics:metrics
views:viewsDictionary]];
[self.button addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[phoneContainerView]-5-[phoneLabel]-5-|"
options:0
metrics:metrics
views:viewsDictionary]];
self.didSetupConstraints = YES;
}
[super updateConstraints];
}
答案 0 :(得分：0)
如果您对数据有所了解，可以实施
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
tableview使用此方法在屏幕的右边缘绘制滚动条。如果可能，请为此提供一些数据，如＆＃34;大单元格 - ＆gt; 200.f＆＃34;或＆＃34;小细胞 - ＆gt; 50.f＆＃34 ;.这有帮助，因为tableview可以更好地了解其内容的大小。