xcode4

问题 I am using core plot library to display scatter chart in my app i display the scatter chart in my app from tutorial http://www.raywenderlich.com/13271/how-to-draw-graphs-with-core-plot-part-2 now i want that the user can see the animation of chart i-e frist the is drawn from 1st point to 2nd point after a small period of time than draw from 2nd to 3rd and so on and the user can see the animation. 回答1: There is currently no built-in support for this. You could use a timer to control the

问题 Im going through Apple's OSX Cocoa (Your First Mac Application) tutorial and am up to refactoring the app delegate. I have created my own controller class. I don't understand how to "Create an instance of the controller class in the nib file". I'm using Xcode 4. 回答1: Drag an 'Object' from the 'Object Library' in the right pane onto your nib. Next, select the object that you dragged into the nib, and then select the identity inspector (third icon from the left in the top right pane). From

问题 I am getting data from json server asynchronously and I am putting them in my table view cells.I am trying to make the cell height on dynamic basis depending upon the text content. I have found about it on internet but everywhere its given the same code , using - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath I am not getting how to implement this.Please guide me. 回答1: In this method, calculate the height of images, text being used in each row and

问题 I have made a TabBar project using xcode's templates and I have the tabbar in the mainwindow.xib ofcourse. once after the user logs into the app, I redirect them to a page called notifications, [self presentModalViewController:controller animated:YES]; but the tabbar doesnt show up. now how can I either include the tabbar in the code above or get the tabbar from mainWindow.xib and display it once the UIView is loaded? Thanks 回答1: Does your 'log in' view display the TabBar? If so, that's

问题 I am trying to get some code in a view working. I have declared a delegate and it does not get instantiated, any Idea what I am missing? I have tried to summarise how I have done this below. I think that the issue is that somewhere, my dataSource delegate needs to be instantiated. I have a View called graph view and a delegate that is in the viewcontroller GraphViewController. I know that the method in GraphView is doing something as it calls the AxisDrawing helper class and draws in Axes.

问题 I want to test my app on device and see all the NSLOGs on console while runnig the ap on device.I also want to stop the app at breakpoints but app does not stop on breakpoints and not print NSLOGs .I have unchecked load symbols lazily .I am using a debug build .Please tell me how to achieve this Thanks in advance NOTE:After starting the app x code shows the app being debugged is not being run (I think the problem is after xcode transfers the app to device then it disconnects with device) 回答1:

问题 I am unable to debug my project as the breakpoints are not working. I have enabled breakpoint option but still its not helping me. I found some links but they are for the Xcode3 And for Xcode4 I found this site but it doesn't have any solution. What should I do ? 回答1: Open Scheme drop box Click on Edit Scheme Click on Run YOURAPP.app tab on the left Set Build Configuration to DEBUG Set Debugger to LLDB Enable breakpoints and Run the app 回答2: Ran face first into this problem after updating to

问题 My Mac app is crashing with exc_bad_access on the run loops. So I enabled NSZombies, and Now I don't see such error as expected ( As the objects are not de-allocated). But, I don't find any useful NSZombie Log in the console. Is there a way to identify the issue ? 回答1: It's challenging. The most common cause of this error in Cocoa is directly accessing your ivars rather than using accessors. Accessors make the vast majority of memory crashes go away. That said, they're not the only cause of

问题 //NsMutableArray //Received memory warning, while using animations in UIImageview like; self.imageArray = [[NSMutableArray alloc] initWithCapacity:IMAGE_COUNT]; // Build array of images, cycling through image names if (![self.imageArray count]>0) { for (int i = 0; i < IMAGE_COUNT; i++){ if (i<10) { [self.imageArray addObject:[UIImage imageNamed:[NSString stringWithFormat:@"image000%d.jpg", i]]]; }else { [self.imageArray addObject:[UIImage imageNamed:[NSString stringWithFormat:@"image00%d.jpg"

问题 I am having some trouble with dismissing a collection of UIViewController objects. I do not know of an elegant way to dismiss all loaded modal UIViewController objects at once. I make use of the "storyboard" in Xcode 4, but I do not use Segues to map the screens. I use dynamic code, like so: It all starts in MainViewController.m. I load [myMenuController] (a menu list). When the user selects an option from the menu, it then loads [myTicketController]. After some user interaction there, it