IOS里面有些看起來是那么回事，想起來也是那么回事另假，結果不是那么回事的事像屋。
1.crash？##
代碼片段1
NSString *string = @"123"; [string release]; string = @"456";//crash?代碼片段2
NSObject *object = [[NSObject alloc] init]; [object release]; [object doSomething];//crash?代碼片段3
- (void)setupSomething { self.object = [[NSObject alloc] init]; [self.object release]; [self doSomething]; } - (void)doSomething { [self.object doSomething];//crash边篮？ }
2.equal开睡？##
NSString *str1 = @"123"; NSString *str2 = @"123"; BOOL eq1 = (str1 == str2); //NO? BOOL eq2 = [Str1 isEqual:str2];//YES? BOOL eq3 = [str1 isEqualToString:str2];//YES?
3.MD5？##
MD5加密苟耻？
