iOS中 OC字符串 與 C語言字符串 相互轉換

1、C字符串轉OC字符串

const char *cString = "This is a C string";
    //對象方法
    NSString *ocString1 = [[NSString alloc] initWithUTF8String:cString];
    NSString *ocString2 = [[NSString alloc] initWithCString:cString encoding:NSUTF8StringEncoding];
    NSString *ocString3 = [[NSString alloc] initWithFormat:@"%s",cString];
    
    //類方法
    NSString *ocString4 = [NSString stringWithCString:cString encoding:NSUTF8StringEncoding];
    NSString *ocString5 = [NSString stringWithUTF8String:cString];
    NSString *ocString6 = [NSString stringWithFormat:@"%s",cString];

 

 

2、OC字符串轉C字符串

NSString *ocString = @"This is a OC string";
    //對象方法
    const char *cString1 = [ocString cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cString2 = [ocString UTF8String];