[英]How to insert a NSString into a NSMutableString?
我有一个NSMutableString,我需要在两个地方插入另一个NSString。 我的NSMutableString是
NSMutableString *webServiceLinkWithResponses = [[NSMutableString alloc] initWithString:@"http://lmsstaging.2xprime.com/services/ParticipantService.cfc?method=setVideoExamResults&student_id=10082&course_id=VRT_TRA&lesson=904&examtype=r&question_num=&ansValue="];
我需要在“question_num =”之后插入一个String(一个),在“ansValue =”之后插入另一个字符串(One),所以我的最终字符串应该像
有什么建议吗?
以下将创建一个未保留的NSMutableString
:
NSMutableString *webServiceLinkWithResponses = [NSMutableString stringWithFormat:@"http://lmsstaging.2xprime.com/services/ParticipantService.cfc?method=setVideoExamResults&student_id=10082&course_id=VRT_TRA&lesson=904&examtype=r&question_num=%@&ansValue=%@", stringOne, stringTwo];
如果需要保留它,只需使用[[NSMutableString alloc] initWithFormat:@"..."]
:
NSMutableString *webServiceLinkWithResponses = [[NSMutableString alloc] initWithFormat:@"http://lmsstaging.2xprime.com/services/ParticipantService.cfc?method=setVideoExamResults&student_id=10082&course_id=VRT_TRA&lesson=904&examtype=r&question_num=%@&ansValue=%@", stringOne, stringTwo];
你真的需要它成为一个可变的字符串,你是否会在创建后更改它? 如果不是简单地将NSMutableString
更改为NSString
,例如(这将返回一个自动释放的NSString
,如果需要保留,则使用[NSString alloc] initWithFormat:]
):
NSString *webServiceLinkWithResponses = [NSString stringWithFormat:@"http://lmsstaging.2xprime.com/services/ParticipantService.cfc?method=setVideoExamResults&student_id=10082&course_id=VRT_TRA&lesson=904&examtype=r&question_num=%@&ansValue=%@", stringOne, stringTwo];
尝试这个:
NSMutableString *webServiceLinkWithResponses = [[NSMutableString alloc] initWithString:[NSString stringWithFormat: @"http://lmsstaging.2xprime.com/services/ParticipantService.cfc?method=setVideoExamResults&student_id=10082&course_id=VRT_TRA&lesson=904&examtype=r&question_num=%@&ansValue=%@",yourFirstString,yourSecondString];
告诉我它是否有帮助!
我的方式是:
NSMutableString *webServiceLinkWithResponses = [[[NSString stringWithFormat: @"http://lmsstaging.2xprime.com/services/ParticipantService.cfc?method=setVideoExamResults&student_id=10082&course_id=VRT_TRA&lesson=904&examtype=r&question_num=%@&ansValue=%@",yourFirstString,yourSecondString] mutableCopy] autorelease];
根据来自dreamlax的提示,您还可以使用:
NSMutableString *webServiceLinkWithResponses = [NSMutableString stringWithFormat:@"http://lmsstaging.2xprime.com/services/ParticipantService.cfc?method=setVideoExamResults&student_id=10082&course_id=VRT_TRA&lesson=904&examtype=r&question_num=%@&ansValue=%@", stringOne, stringTwo];
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