nsstring

I have written this function which shuffles the contents of a NSString , and it seems to work, but every now and then it crashes. This may be a roundabout way, but I put the characters into an array, swap the elements in the array randomly, and then turn the array back into a string. I'm not sure what I am doing that is unsafe which makes it crash. I thought it was possibly that I am setting finalLettersString = result , but I also tried finalLettersString = [NSString stringWithString:result] and that also crashes. The reason I am confused is because it does not crash every time. I just keep

I need to create an NSString, so I can set its value in one class and get it in another. How can I do it? if you write: NSString *globalString = @"someString"; anywhere outside a method, class definition, function, etc... it will be able to be referenced anywhere. (it is global!) The file that accesses it will declare it as external extern NSString *globalString; This declaration signifies that it is being accessed from another file. Make it a global variable. In one file in global scope: NSMutableString *myString = @"some funny string"; In the other file: extern NSMutableString *myString;

My application gets handed an NSString containing an unsigned int . NSString doesn't have an [myString unsignedIntegerValue]; method. I'd like to be able to take the value out of the string without mangling it, and then place it inside an NSNumber . I'm trying to do it like so: NSString *myUnsignedIntString = [self someMethodReturningAString]; NSInteger myInteger = [myUnsignedIntString integerValue]; NSNumber *myNSNumber = [NSNumber numberWithInteger:myInteger]; // ...put |myNumber| in an NSDictionary, time passes, pull it out later on... unsigned int myUnsignedInt = [myNSNumber

I'm trying to convert NSData generated from NSKeyedArchiver to an NSString so that I can pass it around and eventually convert it back to NSData. I have to pass this as a string (I'm using three20 URL passing). I've gone through various encodings, UTF8, ASCII, etc. and can't get anything to work. NSKeyedArchiver says that the NSData is formated as a property list: NSPropertyListBinaryFormat_v1_0. Does anyone have any idea how I can convert this NSData to a String and back again? Size of the string isn't an issue. Thanks What you want is: id<nscoding> obj; NSData * data = [NSKeyedArchiver

NS_ASSUME_NONNULL_BEGIN @interface Robot : NSObject @property (copy,readonly) NSString *name; - (nullable instancetype)initWithName:(NSString *)name; - (nullable NSString *)tellMeSomething; @end NS_ASSUME_NONNULL_END 来源： https://www.cnblogs.com/zhang-pengcheng/p/11797627.html

When reading a text file that was created somewhere else outside my app, the encoding used is unknown. My app has being using NSUnicodeStringEncoding (which is the same as NSUTF16StringEncoding) so have problems reading other than UTF16 encoded files. Is there a way I can guess the encoding of a file? My priority is to be able to read UTF8 files and then all other files. Is iterating through available encodings and check if read string's length is more than zero is really a good approach? Thanks in advance. Ignacio Ole Begemann Apple's documentation has some guidance on how to proceed: String