nsstring

问题 I get a return number(0 for success, 1 for failure) form sever made by php so I want get this number to judge my operation succeeded or not. I use this : var str1 :String = NSString(data: d, encoding: NSUTF8StringEncoding)! let str2 = "1" println(str1) // output is 1 println(str2) // output is 1 if(str1==str2){println("same")} //but the two is not same so I debug for this and I get this result: //str1 _countAndFlags UWord 13835058055282163717 -4611686018427387899 //str2 _countAndFlags UWord 1

问题 I need to convert a lot of long long's to NSString. What is the fastest way to do this? I am aware of two ways to do this and I am wondering if there is anything else that would be faster. NSString* str = [NSString stringWithFormat:@"%lld", val]; And NSString* str = [[NSNumber numberWithLongLong:val] stringValue]; where val is a long long (64 bit int). The first method has the small overhead of parsing the string and the second has the overhead of allocating an additional object. Most likely

问题 I need to get the value of a UIImage's image as a string. Previously I was doing: if(images[imageNo].image == [UIImage imageNamed:@"image1.png"]) { But now I have a lot more conditions so I would like to use a switch, doing: switch(images[imageNo].image) { case @"image1.png": break; } Is there a way to achieve this? Thanks! 回答1: Both of your approaches are incorrect. The first one relies on caching (which is not documented), meanwhile the second is a syntax error - the 'case' keywords expect

问题 In my objective-c project, I have a protocol like this: @protocol MyProtocol -(id) get:(NSString *) key; -(void) set:(NSString *) key withValue:(id) value; -(NSValue *) getSize; -(void) setSize:(NSValue *) value; -(NSValue *) getBounds; -(void) setBounds:(NSValue *) value; @end OBJC_EXPORT const NSString *MYPROTOCOL_SIZE; OBJC_EXPORT const NSString *MYPROTOCOL_BOUNDS; And basically, those specific methods ( getSize , getBounds , setSize , setBounds ) are supposed the value that is supposed to

问题 I have a string like: 1 this is my first text 2 his is my second 3 this is my third 4 this is my forth etc etc.. Each sentence is between the numeric characters like 1 2 3 4 etc When I tap the first sentence, it needs to dissect it and copy it in clipboard or something. How can we use he NSScanner or NSRange to calculate the string size or identify strings between the numeric characters. self.multiPageView.text =combined; the combined contains the text like above ,,so when i tap the first

问题 I have an NSString , firstWord , that has the value of "First". It was defined like this: NSString *firstWord = [[NSString alloc] init]; firstWord = [textView text]; However, when I try to check its value, like so: if (firstWord == @"First"){} The comparison does not return true, or YES I guess in Objective-C. I know that it does have the same value as a string. So, from this I am pretty sure that the issue is that I am comparing pointers, which are not the same here, even though the strings

问题 Note: I have stored NSData in local database. I want to use it back from local database. But as it is stored in local database as text ,facing issue in converting back it into NSData . strDbData is object of type NSString here. I have one NSData stored in local database like <a3829c97 3b1efacb c7680f7e 7e7a95a2> Now I want to retrive it back, so I am doing as mentioned below but I am receiving error. 1) First way NSData *myData = (NSData*)strDbData; NSLog(@"%@",[myData class]); Error : -[_

问题 I'm using a text file to save the changes made by a user on a list (the reason that I'm doing this is so that I can upload the text file to a PC later on, and from there insert it into an Excel spreadsheet). I have 3 data structures: A NSMutableArray of keys, and a NSMutableDictionary who's key values are MSMutableArrays of NSStrings. I iterate through these data structures and compile a file string that looks much like this: (Key);(value)\t(value)\t(value):\n(Key);(value).. .so on. SO, onto

问题 I'm storing text in a sqlite file and setting the text of a UITextView to be the value of that text. The only problem is that the UITextView isn't honoring the newline character. Instead, it's printing it out as text. Here's an example: Stored in fruit.sqlite and passed to theFruit object: requiredFruit = "apples\n oranges\n pears" NSString *theFruit = [NSString stringWithFormat:@"%@", theFruit.requiredFruit]; generalOutlet.text = theFruit; It Displays apples\n oranges\n pears but I want it

问题 public convenience init(nsurl:NSURL) { var enc:NSStringEncoding = NSUTF8StringEncoding var err:NSError? let str:String? = NSString( contentsOfURL:nsurl, usedEncoding:&enc, error:&err ) if err != nil { self.init(err!) } else { self.init(string:str!) } } Swift is version 1.2, error message is: NSString? is not convertible to string 回答1: With Swift 1.2 automatic bridging between String and NSString has been removed. So you have to explicitly do the cast : let str = NSString(contentsOfURL:nsurl,