#import <UIKit/UIKit.h>

 #import "AppDelegate.h"

 int main(int argc, char * argv[]) {

     @try {

         // 抛出一个自定义异常

         @throw [NSException exceptionWithName:@"My Error" reason:nil userInfo:nil];

     }

     @catch (NSException *exception) {

         // 处理异常

         NSLog(@"%@",exception);

     }

     @finally {

         // 运行

         NSLog(@"run");

     }

     @autoreleasepool {

         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

     }

 }