1.轉(zhuǎn)換函數(shù)轉(zhuǎn)換：
NSString *urlString = [NSString stringWithFormat:@"http://www.baidu.com"];
NSString *encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)urlString,NULL,NULL,kCFStringEncodingUTF8);
NSURL *url = [NSURL URLWithString:encodedString];
2.通過 C 的字符串來轉(zhuǎn)換
NSString *utf8String = @"http://www.baidu.com";
NSString *unicodeStr = [NSString stringWithCString:[utf8String UTF8String] encoding:NSUnicodeStringEncoding];
3.NSURL 中的轉(zhuǎn)換
有時候獲取的url中的中文等字符是亂碼，網(wǎng)頁內(nèi)容也是亂碼，需要進(jìn)行一下轉(zhuǎn)碼才能正確識別NSString，可以用下面的方法
編碼：
- （nullable NSString *）stringByAddingPercentEscapesUsingEncoding：（NSStringEncoding）enc
解碼：
- （nullable NSString *）stringByReplacingPercentEscapesUsingEncoding：（NSStringEncoding）enc
// 1.創(chuàng)建 NSURL 對象
// (1)獲取 urlString
NSString *urlString = [NSString stringWithFormat:@"http://www.baidu.com"];
(2)編碼轉(zhuǎn)換
// NSString *newStr = [urlString stringByReplacingEscapesUsingEncoding:NSUTF8StringEncoding];
NSString *newStr = [urlString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:newStr];
// 2.創(chuàng)建 NSURLRequest 請求對象
NSURLRequest *request = [NSURLRequest requestWithURL:url];
4.以上兩種方法9.0中已經(jīng)棄用了，可以使用以下的方法來代替
編碼
- (nullable NSString *)stringByAddingPercentEncodingWithAllowedCharacters:(NSCharacterSet)allowedCharacters
NS_AVAILBLE(10_9,7_0);
解碼
- @property(nullable,readonly,copy)NSString *stringByRemovingPercentEncoding NS_AVAILABLE(10_9,7_0);
NSString *urlString = [NSString stringWithFormat:@"http://www.baidu.com"];
// 編碼轉(zhuǎn)換
NSString *newStr = ursString.stringByRemovingPercentEncoding;
NSURL *url = [NSURL URLWithString:newStr];
// 創(chuàng)建 NSURLRequest 請求對象
NSURLRequest *request = [NSURLRequest requestWithURL:url];
