iOS如何避免App Crash

获取崩溃信息

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
    NSSetUncaughtExceptionHandler(&uncaughtExceptionHandler);     
}

void uncaughtExceptionHandler(NSException *exception) {

     NSLog(@"CRASH: %@", exception);
     NSLog(@"Stack Trace: %@", [exception callStackSymbols]);         
}

-(BOOL) isValueOfKeyIsNull(id response){
        if([response==[NSNull null]]){
            return true;
        }
        return false;
}

使用@try...@catch避免崩溃

-(void)functionInsideWhichAppIsCrashing
{
    NSArray* arraytest = @[@"1",@"2"];
    @try
    {
        //Your crashing code goes here
        NSLog(@"Object: %@",arraytest[3]);
    }
    @catch (NSException *exception)
    {
        // Print exception information
        NSLog( @"NSException caught" );
        NSLog( @"Name: %@", exception.name);
        NSLog( @"Reason: %@", exception.reason );
    }
    @finally
    {
        // // Do whatever you want to do in crash situation
        NSLog( @"In finally block");
    }
}

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+ (BOOL)nullValue:(id)value {
    return ((NSNull *)value == [NSNull null] || [@"<null>" isEqualToString:(NSString *)value] || [@"(null)" isEqualToString:(NSString *)value] || value == nil);
}