小编Bar*_*rtu的帖子

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell2";
    UILabel *titleLabel;
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(5, 5, 300, 20)];
        [cell.contentView addSubview:titleLabel];
        titleLabel.tag = 0011;
    }
    else 
    {
        titleLabel = (UILabel *)[cell.contentView viewWithTag:0011];
    }

    // Configure the cell...
    NSMutableString *title = [NSMutableString stringWithString:@"Customer: "];
    [title appendString:[titles objectAtIndex:indexPath.row]];
    titleLabel.text = title.copy;
    titleLabel.backgroundColor = [UIColor clearColor];
    titleLabel.textAlignment = UITextAlignmentLeft;
    titleLabel.font = [UIFont systemFontOfSize:18.0];

我的单元格永远不会是零,而我的标题标签,因为它从未被分配,尽管我的单元格已生成.我看不出这是怎么可能的.if状态永远不会是真的,应该是第一次生成的单元格,但是我的单元格应该是按原样创建的,而不是我的titleLabel的

我查看了其他解决方案,但我找不到适合自己的解决方案.我有一个,我UIImageView在UIScrollView那里展示大图.

我在我的UIScrollView以及左右滑动手势识别器中启用了捏合手势.

现在,scrollview的平移手势似乎禁用,(或损坏)滑动手势.我不想禁用水平或垂直滚动UIScrollView,我的照片的初始缩放太大,无法禁用水平滚动.

我想要做的是当我来到UIScrollView的边缘时触发滑动手势.

这是一些代码;

- (void)viewDidLoad
{
    // recognizer for pinch gestures
    UIPinchGestureRecognizer *pinchRecognizer =[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(handlePinch:)];
    [self.myScrollView addGestureRecognizer:pinchRecognizer];
    [self.myScrollView setClipsToBounds:NO];

    // recognizer for swipe gestures
    UISwipeGestureRecognizer *recognizer;

    // left and right swipe recognizers for left and right animation
    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleLeftSwipe:)];
    [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
    [[self myScrollView] addGestureRecognizer:recognizer];

    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleRightSwipe:)];
    [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
    [[self myScrollView] addGestureRecognizer:recognizer];
    ....

我的左侧滑动处理程序,目前左右滑动没有任何其他功能

-(void)handleLeftSwipe:(UISwipeGestureRecognizer *)recognizer
{    
    if(!self.tableView.hidden) self.tableView.hidden = YES;
    [self …

可能重复:
管理两个NSURLConnection
NSURLConnection委托

我有两种不同的方法可以调用不同的NSURLConnections;

方法A.

NSURLConnection *serverConnection = [[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:addressOfSideWebService]] delegate:self];

方法B.

NSURLConnection *serverConnection = [[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:addressOfMainWebService]] delegate:self];

问题是,这两个NSURLConnections都会触发相同的委托;

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [self.serverData appendData:data];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{    
    NSString *response = [[NSString alloc]initWithData:self.serverData encoding:NSUTF8StringEncoding];
    // use data
}

我想知道的是,我们可以标记NSURLConnections'或称为NSURLConnection的方法,以便识别我可以对其采取行动的函数或方法.

我们可以设置不同的代表,还是我应该遵循的任何其他方法？

我希望我很清楚,可以提供任何其他信息.谢谢.

我已经为我的自定义创建了一个xib文件,UIView并将我的xib加载到我的自定义UIView中;

NSArray *views = [[NSBundle mainBundle] loadNibNamed:@"ProductDetailView" owner:self options:nil];
self = [views objectAtIndex:0];

我不想将我的所有子视图定义为IBOutlets,所以我认为迭代子视图会更合适.

        for (id subview in self.subviews) {
            if ([subview isKindOfClass:[UIView class]]) {
                UIView *theView = (UIView*)subview;
                if (theView.tag == 16) {
                    // tag 16 is specific to some UIViews... do stuff
                }
            }
            else if ([subview isKindOfClass:[UILabel class]]) {
                UILabel *theLabel = (UILabel*)subview;

                if (theLabel.tag == 21) {
                    // tag 17 is specific to some UILabels... do stuff
                }
                else
                {
                    // no …

我有一个具体CGSize的UILabel,我不能扩展框架,UILabel因为它是一个多行UILabels adjustsFontSizeToFitWidth方法不起作用.

所以我想我应该创建一个看起来像这样的功能;

- (CGFloat)fontSizeWithText:(NSString*)text andFont:(UIFont*)font constrainedSize:(CGSize)size LBM:(UILineBreakMode)LBM
{
    // check if text fits to label
    CGSize labelSize = [text sizeWithFont:font constrainedToSize:CGSizeMake(size.width, 9999) lineBreakMode:LBM];

    // if not, decrease font size until it fits to the given size
    while (labelSize.height > size.height) {
        font = [UIFont fontWithName:font.fontName size:font.pointSize - 0.5];
        labelSize = [text sizeWithFont:font constrainedToSize:CGSizeMake(size.width, 9999) lineBreakMode:LBM];
    }

    return font.pointSize;
}

用法:

// fit detail label by arranging font's size
    CGFloat fontSize = …

我正在使用a UITableViewController,我想要做的是在下面添加一个自定义工具栏UIView.

我已经尝试启用navigationController(下面的代码)的工具栏,但它似乎无法正常工作.UITextField不会调用代理,文本字段的按键不会显示在文本字段中.

使用像这样的工具栏不是我的第一选择,我想在我的UITableViewController下我的自定义视图,我可以放置我的项目,就像一个UIToolbar.(保持为UIView页脚)

码:

    self.navigationController.toolbarHidden = NO;
    // create toolbar objects
    UITextField *inputField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 230, 31)];
    inputField.backgroundColor = [UIColor clearColor];
    inputField.borderStyle = UITextBorderStyleRoundedRect;
    inputField.inputAccessoryView = self.navigationController.toolbar;
    inputField.returnKeyType = UIReturnKeyDone;
    inputField.delegate = self;


    UIButton *sendButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 50, 30)];
    sendButton.titleLabel.text = @"Send";
    sendButton.backgroundColor = [UIColor greenColor];

    // add objects into navigation controller
    self.toolbarItems = [NSArray arrayWithObjects:
                         [[UIBarButtonItem alloc] initWithCustomView:inputField],
                         [[UIBarButtonItem alloc] initWithCustomView:sendButton], nil];

我正在为我的应用程序(基本SDK:iOS5)使用Facebook SDK 3.0并使用Scrumptious应用程序(示例应用程序)作为教程.如果Facebook没有开放会话,则会以模态方式呈现登录视图控制器.但它没有以模态呈现.这是代码;

- (void)showLoginView {
    UIViewController *topViewController = [self.navigationController topViewController]; // not nil, RootViewController kind of class
    UIViewController *modalViewController = [topViewController modalViewController]; // nil since not modalviewcontroller exists

    if (![modalViewController isKindOfClass:[FacebookLoginViewController class]]) {
        FacebookLoginViewController *loginViewController = [[FacebookLoginViewController alloc] initWithNibName:@"FacebookLoginViewController" bundle:nil]; // allocated, no problem
        [topViewController presentModalViewController:loginViewController animated:NO]; // not working????

    } else {
        FacebookLoginViewController* loginViewController = (FacebookLoginViewController*)modalViewController;
        [loginViewController loginFailed];
    }
}

细节;

• showLoginView是在application:didFinishLaunchingWithOptions:分配navigationController后调用和调用的
• RootViewController该navigationController的调用viewDidLoad方法之前showLoginView叫
• 在showLoginView,topViewController是不是零(这是什么是应该是:RootViewController)
• navigationController是一种类UINavigationController(不是自定义的) …