nsstring

问题 I have taken an NSString from one class to another to be saved on parse.com I have a quiz view controller where a user enters a question in a UITextView and then they press next to go to the select friends view controller where they select a user and then send the question over parse. quiz.h @property (nonatomic,strong) IBOutlet UITextView *textField; @property (nonatomic, strong) NSString *text; quiz.m - (void)viewDidLoad { [super viewDidLoad]; UITextView *textView = [[UITextView alloc] init

问题 MasterViewController.m #import "DetailViewController.h" - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([segue.identifier isEqualToString:@"DetailViewControllerSeque"]) { DetailViewController *detailView = [segue destinationViewController]; NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; theList = [app.listArray objectAtIndex:indexPath.row]; detailView.theList = theList; // String to pass to DetailViewController detailView.string2pass = @"this is

问题 I have an NSTextField and get its contents like so NSString *s = [textField stringValue] Now I want to convert this NSString to a string that my platform-independent C code can handle. Thus I'm doing: const char *cstr = [s cStringUsingEncoding:NSISOLatin1StringEncoding]; What I don't understand now is how long this "cstr" pointer stays valid. Apple docs for cStringUsingEncoding say: The returned C string is guaranteed to be valid only until either the receiver is freed, or until the current

问题 I am converting NSString to NSNumber . But the problem is that if NSString starts with zeros then converting it to NSNumber ignores the initial zeros. I know initial zeros doesn't mean anything but I want to keep initial zeros because it's phonenumber in my case. here is my code: NSLog(@"test1: %@",tempPhoneNumber); NSNumberFormatter *formatter=[[NSNumberFormatter alloc] init]; [formatter setNumberStyle:NSNumberFormatterDecimalStyle]; NSNumber *tempPnoneNumberNumber=[formatter

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I have two strings that are taken as input from a textfield in my application. I know that they are both 4 characters in length. Is there some way I can "halve" those strings, and create two strings per original

问题 This is my Code so far: NSString *listedImageURL = listedProduct.image; NSLog(@"URL: %@", listedImageURL); This Code works fine and NSLog shows me the correct URL. But when I try the following Code, NSLog shows up (null): NSString *listedImageURL = listedProduct.image; NSURL *imageURL = [NSURL URLWithString:listedImageURL]; NSData *imageData = [NSData dataWithContentsOfURL:imageURL]; UIImage *image = [UIImage imageWithData:imageData]; What am I doing wrong?? 回答1: I believe that relower is on

问题 Hey, I am trying to convert NSString to a C string using cStringUsingEncoding but I have a memory leak. My understanding is that cStringUsingEncoding returns a pointer to a character array that is only guaranteed to exist for the duration of the NSString object. As such you should copy its contents to another string. Here's where my problem lies... I have a function that accepts an NSString and turns it into a C-string copy. Just for testing I ran 1,000 iterations of the following method (to

问题 I have this if statement to check if a URL starts with a prefix: NSString *baseUrl = @"http://example.com/"; NSString *currentURL = @"http://example.com/confirm"; if( [currentURL hasPrefix:[baseUrl stringByAppendingString:@"confirm"]] ){ // True, so do something... } I would like to modify the hasPrefix part of my if statement so that it returns true if currentUrl is appended by ANY of the values in my NSArray shown here: NSArray *pages = [NSArray arrayWithObjects:@"confirm",@"products",nil];

问题 I need to get a long value from an NSString . For example, I have this: NSString *test = @"5437128"; and I need : long myLong = 5437128; How I can get this long value from the NSString ? Thank you, it will help me! 回答1: Use the NSScanner like in the following code: unsigned x; [[NSScanner scannerWithString: s2] scanHexInt: &x]; when typing the scanHexInt stop at scan and see yourself which one you need - there are many possibilities to get values from strings.... You might want to use

问题 i think it is a simple question but i dont know how to solve it. i have a NSString that containes html content. i want to extract some tags. NSString *string=@"test some text <img src='http://www.xyz.com/a.jpg' > blah blah <a href='asdfg'>aaaa</a> bbbb cccc"; i want to take img & "a" tag into new string. then i will display it in UIWebView. how can i parse it? 回答1: The best way is to write a partial tag parser. This is not very difficult. Another option is to simply find the position of src='