nsstring

问题 I have a problem. I want to change the black diamond question mark (U-FFFD) with white space. How could I search the character (black diamond question mark) so I can change it with white space? Thank you for your attention. 回答1: [theString stringByReplacingOccurrencesOfString:@"\ufffd" withString:@" "]; 回答2: Solve black diamond with question mark. just use this: foreach($disp as $objs) { $objs = preg_replace( '|[^.?,A-Za-z0-9-]+|', ' ', $objs); echo $objs; } // this will display character (.

问题 In my app I want to show a String that contains news. This string is being loaded just from a free Website, so the plain source code of the website does not contain only my string, its is more os less like this: Stuff More Stuff More HTML Stuff My String More HTML Stuff Final Stuff And of course i want to cut off all the html stuff that i don't want in my NSString. Since i am going to change the String fron time to time the overall length of the Source code from the website changes. This

问题 In my app I want to show a String that contains news. This string is being loaded just from a free Website, so the plain source code of the website does not contain only my string, its is more os less like this: Stuff More Stuff More HTML Stuff My String More HTML Stuff Final Stuff And of course i want to cut off all the html stuff that i don't want in my NSString. Since i am going to change the String fron time to time the overall length of the Source code from the website changes. This

问题 How to convert an "initWithBytes" NSString to unsigned char*? here's how the NSString produced NSString *byte = [[[NSString alloc] initWithBytes:inputbytes length:inputlength encoding:NSASCIIStringEncoding] autorelease]; which contains bytes data that should not be changed in bit level(will be the input of base64 conversion) The data in the byte is 0x01 0x00 0x01, 3 bytes and I want to convert it into an unsigned char* How should I do it? Thanks 回答1: Generally speaking, you should work with

问题 I am trying to determine the recommended way to set default values for NSString properties. I understand it is not safe to use accessor methods in a class's init and dealloc methods. I often have string constants that I would like to assign default values. What is the recommend way to do this (considering the iVar will be released in the dealloc method)? For example I understand the following is unsafe: @property (nonatomic, copy) NSString *identifier; .... - (id) init { self = [super

问题 I've been searching for an answer to this question on google and some other forums, but I haven't found the answer yet. It seems like a simple enough question: how do I manually insert a newline into UITextView's text field? If it matters, I'm reading my string from an SQLite database. That means that I'm translating a const char (I think - at least I've been casting it as such) into an NSString before I use it in UITextView's -setText. I've tried inserting '\n' into the SQLite database, but

问题 I need to convert a NSData object to an NSString. It is meant to be gibberish but I need it for debbuging. When I use NSString's initWithData, it breaks as the data has NULL bytes. How can I make it ignore the null bytes and get a proper string? 回答1: Copy the NSData to a NSMutableData, byte by byte, skipping any null bytes. Then initialise the string from that. 来源： https://stackoverflow.com/questions/3949628/convert-nsdata-to-nsstring-and-ignore-null-bytes

问题 I am creating one application using airdrop feature, I want to pass one message(NSString) from one device to other device. I had completed that part, but I want restrict this feature for my application only. Currently what happen, when I am sending NSString via airdrop (let say Device A) in near by device, the other Device B can receive this string even if my application is not installed in it. My requirement is to share one message from one device to other device only and this thing happen

问题 How I can split a string into equal parts and not a character, ie, a string that is 20 characters divided into 5 strings with 2 characters each no matter what kind of character is? don't work to me [NSString componentsSeparatedByString]: because the characters change randomly. i'm using objetive-c on xcode 5 回答1: This is just an example of what you're probably looking to do. This method assumes the length of the string is evenly divisible by the intended substring length, so having a test

问题 I'm trying to load pictures from twitter. If i just use the URL in the json results without encoding, in the dataWithContentsOfURL , I get nil URL argument. If I encode it, I get as follow's %0A%20%20%20%20%22http://example.com/example.jpg%22%0A. I know I can use rangeOfString: or stringByReplacingOccurrencesOfString: but can I be sure that it will always be the same, is there another way to handle this, and why is this happening to my twitter response and not my instagram response? I have