nsstring

需求： 有一个通讯列表，可以自行添加联系数据，但是重新开启后，添加的数据都会清空，我希望打开后，上一次的数据能保留。 这我们就必须用到数据持久化，这一次，我将用NSKeyedArchiver 归档 方式来做数据持久化，达到再次打开应用后，数据依然存在。 通讯录.png NSKeyedArchiver、NSKeyedUnarchiver ，主要用在ios数据存储上，数据从内存存储到闪存上，这个过程称为归档。Apple官方文档中，这些数据类型包括： NSData、NSString、NSNumber、NSDate、NSArray、NSDictionary。很显然，复杂数据例如UIImage，无法直接归档。但我们有一种变通的做法，先将UIImage对象转换为NSData，再对NSData进行归档。 一、创建一个数据模型（自定义类） import UIKitclass JKContactModel: NSObject,NSCoding{ var name:NSString! var phone:NSString! func encodeWithCoder(aCoder: NSCoder){ aCoder.encodeObject(self.name, forKey: "name") aCoder.encodeObject(self.phone, forKey: "phone") }

I have a query string: a=1&b=2&c[1]=3&c[2]=4 etc… I want a NSDictionary where a => 1 , b => 2, c => [3,4] . Notice that that the value for c is an array. It should also be able to handle something like c[1][2]=5 to make an array of arrays c => [[5]] . Of course I can do it myself by splitting on the & and = , but what about other cases such as arrays and arrays of arrays. I want a structured NSDictionary from a POST request queryString and do not want to rewrite the wheel if this already exists. Are there any class/method, through Apple or 3rd party, that will parse a query string into a

I want to use zlib because I'm assuming it's the best & fastest way to gzip NSData . But, is there a better way? If not, which version of the zlib library should I link to in Xcode: libz.dylib, libz.1.dylib, libz.1.1.3.dylib, or libz.1.2.5.dylib? Please provide a code example of how to us zlib to convert NSData *normalHTTPBody into NSData gzippedHTTPBody Yes, zlib is what is used to gzip data. I know of no better way. As for speed, you can select the compression level to optimize speed vs. compression for your application. You will likely find that libz.dylib and libz.1.dylib are symbolic

I m taking a NSMutabledictionary object in NSString like this : NSString *state=[d valueForKey:@"State"]; Now sometimes state may be null and sometimes filled with text.So Im comparing it.While comparing state becomes NSString sometimes and NSCFString othertimes..So unable to get the desired result.. if([state isEqualToString@""]) { //do something } else { //do something } So while comparing it is returning nil sometimes.So immediately jumping into the else block. I need a standard way to compare if the state is empty whether it is a NSString or NSCFString ... How can I do it? If you're unable

I have a NSMutableArray composed of NSAttributedString 's. I'm trying to convert it to a single NSAttributedString separating all the NSAttributedString 's with a character. This approach is similar to the conversion of an array to a NSString with the componentsJoinedByString:@"," method but unfortunately this method doesn't exist with the NSAttributedString . How can I convert the array? Thanks. I'd to the old way: NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] init]; NSAttributedString *jointElement = [[NSAttributedString alloc] initWithString:@","] for (int i = 0; i

I have some Objective-C++ code like this: // header @interface MyObjcClass - (void) myMethod: (NSString *) text; @end // implementation @implementation MyObjcClass - (void) myMethod: (NSString *) text { someInternalObject->useWstring(nsStringToWstring(text)) } std::wstring nsStringToWstring(const NSString * text) { NSData * data = [text dataUsingEncoding: NSUTF32LittleEndianStringEncoding]; // and then some other stuff irrelevant to this question return std::wstring(pointerToNewString, pointerToNewString + stringLength); } @end Straightforward so far; seems fine to me. And works great when