objective-c - NSException与NSError区别？-PHP Chinese Network Q&A

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objective-c - NSException与NSError区别？

怪我咯 2017-04-21 11:15:57

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NSException与NSError在使用中有哪些区别？

#import  int main (int argc, const char * argv[]) { @autoreleasepool { NSException* ex = [[NSException alloc]initWithName:@"MyException" reason:@"b==0" userInfo:nil]; @try { int b = 0; switch (b) { case 0: @throw(ex);//b=0，则抛出异常； break; default: break; } } @catch (NSException *exception)//捕获抛出的异常 { NSLog(@"exception.name= %@" ,exception.name); NSLog(@"exception.reason= %@" ,exception.reason); NSLog(@"b==0 Exception!"); } @finally { NSLog(@"finally!"); } [ex release]; } return 0; }

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怪我咯

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小葫芦2017-04-21 11:17:57 1 floor

Exceptions and errors are two completely different things. If an exception is thrown but you don't catch it, it will crash. But if an error is returned, you can do whatever you want to the outside world. It just tells you that there is an error in this call.