// 编码 `苹果`->`%E8%8B%B9%E6%9E%9C`
NSString *encode = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// 解码 `%E8%8B%B9%E6%9E%9C`->`苹果`
NSString *decode = [urlString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
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