ios 经典错误

1

- [person test]:unrecognized selector sent to instance.

给penson对象发送一个不能识别的消息：test

 

2

set/get方法死循环错误：

- (void)setAge:(int)age{ self.age = age; }

-(void)age{return self.age;}

 

3

storyboard连线出错

setValue:forUnderfinedkey:I:this class is not key value coding-compliant for the key sumlabel.

 

4

错误：某个对象没有实现某个方法

- [MJViewController up] ： unrecognized selector sent to instance 0x8c50af0