objective-c - NSException与NSError区别？

Question

NSException与NSError在使用中有哪些区别？

#import <Foundation/Foundation.h>

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;
}

https://developer.apple.com/library/m...

https://developer.apple.com/library/m...

Answer 1

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.