摘要：
Q:@synthesize propertyname = _propertyname; 为什么要使用 _propertyname？什么时候用self.propertyname ，什么时候用_propertyname？A:当：@synthesize propertyname = _propertyname;An initialization method is one of two places in which you should not use accessor methods to access properties (the other place is in a dealloc me 阅读全文
