objective-c - @try @catch 不起作用

Question

运行代码会导致崩溃。

 -(NSString*) ExtractStringKeyValue:(NSString*)key
{
    @try {
    NSRange  start = [_responceInfo rangeOfString:key];
    NSRange end  = [[_responceInfo substringFromIndex:start.location + start.length+2] 
                      rangeOfString:@"\""];

    NSRange rang = NSMakeRange(
                               start.location + start.length+1
                               , end.location+1);
    return [_responceInfo substringWithRange:rang];
    }
    @catch (NSException * e) {
        NSLog(@"Exception: %@", e);
    }
    @finally {
        NSLog(@"finally");
    }
}

调试控制台:

2012-02-27 01:10:16.254 Clicky [8665:9203] 异常:* -[NSCFString substringFromIndex:]:范围或索引超出范围

2012-02-27 01:10:16.255 Clicky[8665:9203] 终于

请帮忙。

Answer 1

正如我们在控制台中看到的输出，您的代码通过 @finally block :

2012-02-27 00:28:02.794 Clicky[8409:9203] finally

并根据错误信息Terminating app due to uncaught exception 'NSRangeException', reason: '* -[NSCFString substringFromIndex:]: Range or index out of bounds' ，我可以告诉你，你的问题不在这个方法上。