cocoa-touch

问题 I am getting following error when i use CGContextDrawPDFPage(context, _PDFPage) for some files. Any work around to fix this issue? FT_Open_Face failed: error 2. 回答1: Error 2 looks like errno 2 which is "File not found". Please post more code to confirm this. 来源： https://stackoverflow.com/questions/15267702/got-error-ft-open-face-failed-error-2

问题 I want to save the state of my view controller. I searched and found that I should save the state by saving state variables. But I am interested in saving the view controller object itself. Is there any way to save the view controller object itself so that when I restart the application I see the same view state too on which I was before closing the app. Otherwise I have to reach that state myself and that will not solve the purpose fully as somethings like (the admob ad which was displayed)

问题 I'm using multiple storyboards in my app, which is considered as good practice. For example, from my FooViewController in Main.storyboard , when a button is tapped, I'll jump to another BarViewController defined in Secondary.storyboard programmatically. Transitions among storyboards and view controllers are implemented in a separate file, e.g. Storyboards , like the following: // in Storyboards.m @implementation Storyboards + (id)instantiateBarViewController { UIStoryboard *storyboard =

问题 How can i download an asynchronous multiple images in the UITableView using ASIHttpRequest or something useful? - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { .......... // Creation UIImageView *avatar; UILabel *content; // Tag the IBOutlets avatar = (UIImageView*)[cell viewWithTag:14]; content = (UILabel*)[cell.contentView viewWithTag:4]; // Field avatar.image = image content.text = entryReviewtableView.content; } 回答1: No need to

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 9 years ago . I have seen some people who refuse to use Interface Builder and prefer to make everything using code. Isn't this a bit tedious and

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 9 years ago . I have seen some people who refuse to use Interface Builder and prefer to make everything using code. Isn't this a bit tedious and

问题 My UITableView has an Edit button which adds an "insert row" (with a green plus). If I try to delete a row while in Edit mode, my app crashes with "NSRangeException". Deleting a row while NOT in edit mode (using swipe-to-delete) is fine. I know this is to do with how many rows the table view thinks it has - getting an insert row and swipe-to-delete both to work in the same table is a nightmare (for a beginner like me) because both swiping and pressing the edit button put the table in "edit

问题 My UITableView has an Edit button which adds an "insert row" (with a green plus). If I try to delete a row while in Edit mode, my app crashes with "NSRangeException". Deleting a row while NOT in edit mode (using swipe-to-delete) is fine. I know this is to do with how many rows the table view thinks it has - getting an insert row and swipe-to-delete both to work in the same table is a nightmare (for a beginner like me) because both swiping and pressing the edit button put the table in "edit

问题 Some Cocoa and Cocoa Touch classes declare their delegate properties as assign rather than weak , which forces users of the class to nil out the property in dealloc -(void)dealloc { self.imageScrollView.delegate = nil; self.tableView.delegate = nil; self.tableView.dataSource = nil; } Which is very cumbersome. Why would Apple do it this way? 回答1: The reason why is that not all system classes have been compiled with ARC. You may implement a dealloc method if you need to manage resources other

问题 Some Cocoa and Cocoa Touch classes declare their delegate properties as assign rather than weak , which forces users of the class to nil out the property in dealloc -(void)dealloc { self.imageScrollView.delegate = nil; self.tableView.delegate = nil; self.tableView.dataSource = nil; } Which is very cumbersome. Why would Apple do it this way? 回答1: The reason why is that not all system classes have been compiled with ARC. You may implement a dealloc method if you need to manage resources other