nsstring

I have a NSString that I need to examine character by character and: examine char perform calculation loop (until string ends) Any thoughts on the best way to do this? Do I need to convert the NSString to a NSArray or C string? The simplest way to go about it is using NSString 's characterAtIndex: method: int charIndex; for (charIndex = 0; charIndex < [myString length]; charIndex++) { unichar testChar = [myString characterAtIndex:charIndex]; //... your code here } -characterAtIndex: is the simplest approach, but the best is to drop down to CFString and use a CFStringInlineBuffer, as in this

How to do this using standard methods (without manual iteration through source string)? PS: At final I want to get sorted characters of source string. I tried to use NSCharacterSet , but can't find a method to convert character set to string (without iterating the set). There is no built-in method for this, but it's pretty easy to iterate over the characters of the string and build a new string without duplicates: NSString *input = @"addbcddaa"; NSMutableSet *seenCharacters = [NSMutableSet set]; NSMutableString *result = [NSMutableString string]; [input enumerateSubstringsInRange:NSMakeRange(0

I want to validate the string value after getting in the below parser delegate method I have tried like [string length]>0 ,(string !=NULL) in if condition still blank string is printed in the NSlog.So what is the efficient method to validate the sting.I have used the below code. - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { if ([elemName isEqualToString:@"productName"]) { if (!prodStringValue) { prodStringValue = [[NSMutableString alloc] initWithCapacity:50]; } [prodStringValue appendString:string]; if(prodStringValue && [prodStringValue length]>0 &&

一、简介 在前面一篇文章中讲到过实现JavaScript与Native交互的方式有一种就是使用原生内嵌webView。在iOS8之前，开发者只能使用苹果提供的UIWebView类来加载URL或者HTML网页视图，然后通过设置代理，在回调函数中拦截并处理自定义交互事件，功能十分有限，通常只是作为一个辅助视图使用。在iOS8之后，苹果对这方面的技术进行了重构和优化，推出了一个新的框架WebKit。WebKit提供了Native与JavaScript交互的方法，整个框架的结构很清晰，对外暴露的接口友好实用，极大地方便了开发者实现网页视图和的Native交互。并且，WebKit框架采用导航堆栈的模式来管理网页视图的跳转，对于网页视图的管理和渲染，开发者更加容易管控。慢慢地，咱来比较这两种webView的使用区别。 二、UIWebView 1、UIWebView的详细构成 UIWebView的类构成之：属性 //id类型，遵守UIWebViewDelegate协议 @property (nullable, nonatomic, assign) id <UIWebViewDelegate> delegate //只读属性，webView内部的滚动视图 @property (nonatomic, readonly, strong) UIScrollView *scrollView //只读属性

I have a set with the characters I allow in my string: var characterSet:NSCharacterSet = NSCharacterSet(charactersInString: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ") I want to strip any other characters from a string so two unformatted data can be considered equal, like this: "American Samoa".lowercaseString == "american_samoa1".lowercaseString the lowercase version of these transformed strings would be "americansamoa" mustafa Let's write a function for that (in swift 1.2). func stripOutUnwantedCharactersFromText(text: String, set characterSet: Set<Character>) -> String { return

block 的注意事项 使用 copy 修饰属性 想不循环应用，那么在 block 外面这样声明 __weak __typeof(self)weakSelf = self; 接着，在 block 里面这样 __strong __typeof(weakSelf)strongSelf = weakSelf; 这样既防止循环应用，又避免 block 内部 self 会无效的可能 AFNetworking 里面这样使用的很多 UITableView 的优化 最基本的，cell 重用机制，如果这个都不知道的话，那可以去撞墙了。。。 异步加载数据，这个也是很基本的 自动载入更新数据，比如每次载入20条信息，然后在滚动到最后5条信息，就加载更多的信息 图片下载完成以后，判断 cell 如果是可见的，那么就需要更新图像 GCD 异步请求，我只认准 GCD | GCD异步，你值得拥有 （广告先走一波） 网络请求放在子线程，UI 只能在主线程更新 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) { // 处理各种耗时间的事情，比如网络请求数据，天知道要什么时候才能结束 dispatch_async(dispatch_get_main_queue(), ^(void) { //

I have searched the site for my answer, however I think it is also how I got myself into this problem. I'm trying to limit my 1 and only text field to 10 characters and only numbers. Below is code mostly off other questions on this site. What I am trying to do is mash this code together for my limits - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:LEGAL] invertedSet]; NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]