NSString *encode = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)str , NULL, (CFStringRef)str, kCFStringEncodingUTF8));
NSString *encode = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)str , NULL, (CFStringRef)str, kCFStringEncodingUTF8));