Objective-C中的Try-Catch等价物-Try-CatchequivalentinObjective-C

13  

Although Objective-C does have an @try/@catch, it is not going to help you much. By the time you get to the @catch, the stack frame where the error happens would be gone.

尽管Objective-C确实有@ try / @ catch,但它对你没什么帮助。当你到达@catch时,发生错误的堆栈帧就会消失。

What you need is to set up a breakpoint that breaks on exception: open the Breakpoint Navigator page (the second button from the right), and click [+] at the bottom of the navigator page. Choose "Add Exception Breakpoint...", then click [Done].

您需要的是设置一个断开异常的断点:打开Breakpoint Navigator页面(右起第二个按钮),然后单击导航器页面底部的[+]。选择“添加异常断点...”,然后单击[完成]。

Now the program is going to break in the debugger each time that your program throws an exception.

现在,每当程序抛出异常时,程序就会在调试器中中断。

8  

I gave the try catch syntax below, but in addition to that, what you can do is that, in Xcode, you can set breakpoints. In the left hand side on your project explorer, click on Breakpoints tab. At the bottom left, you will find a +. (pictures above) Click on that and it will give you an option to set exception breakpoint. What this will do is that it will stop at any line where there is a crash. You there fore need not set try catch statements every where.

我在下面给出了try catch语法,但除此之外,你可以做的是,在Xcode中,你可以设置断点。在项目资源管理器的左侧,单击“断点”选项卡。在左下角,你会发现一个+。 (上图)单击它,它将为您提供设置异常断点的选项。这将做的是,它会在发生崩溃的任何一条线路上停下来。你不需要在每个地方设置try catch语句。

@try {

    // Your statements here
 }
 @catch (NSException * e) {
    NSLog(@"Exception: %@", e);
 }
 @finally {
    NSLog(@"finally");
 }

3  

    //////////////////////ADVANCED TRY CATCH SYSTEM////////////////////////////////////////
    #ifndef UseTryCatch
    #define UseTryCatch 1
    #ifndef UsePTMName
    #define UsePTMName 0  //USE 0 TO DISABLE AND 1 TO ENABLE PRINTING OF METHOD NAMES WHERE EVER TRY CATCH IS USED
    #if UseTryCatch
    #if UsePTMName
    #define TCSTART @try{NSLog(@"\n%s\n",__PRETTY_FUNCTION__);
    #else
    #define TCSTART @try{
    #endif
    #define TCEND  }@catch(NSException *e){NSLog(@"\n\n\n\n\n\n\
    \n\n|EXCEPTION FOUND HERE...PLEASE DO NOT IGNORE\
    \n\n|FILE NAME         %s\
    \n\n|LINE NUMBER       %d\
    \n\n|METHOD NAME       %s\
    \n\n|EXCEPTION REASON  %@\
    \n\n\n\n\n\n\n",strrchr(__FILE__,'/'),__LINE__, __PRETTY_FUNCTION__,e);};
    #else
    #define TCSTART {
    #define TCEND   }
    #endif
    #endif
    #endif
    //////////////////////ADVANCED TRY CATCH SYSTEM////////////////////////////////////////






Use TRY CATCH IN ANY METHOD LIKE THIS


-(void)anyMethodThatCanGenerateException
{
    TCSTART


    TCEND
}