Objective-C 异常处理

 #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]));
     }
 }