为什么我不能通过Interface Builder将左栏按钮项添加到导航项？

Question

It only allows me to add the right barbutton, but when I drag another barbuttonitem, it's simply denied. I looked at the properties of NavigationItem, and I saw that there are outlets for right barbutton and even for the back barbutton. So: why can't I add a left barbutton item to the Navigation Item (through Interface Builder)?

Answer 1

Yeah, using it programatically is probably (way) better. Use [self.navigationController pushViewController:<otherviewname> animated:YES]; This way, in the next view, there is a backbutton to this screen added automatically (unless you decide to hide the backbutton programatically in that next view, but that's a whole different story). The advantage of pushViewController instead of modalTransitionView is that navigation-options are so easily added!

Answer 2

如果在视图属性中定义了按钮，则似乎无法向导航栏添加按钮，但是如果从对象库添加导航栏，则可以添加按钮（左侧和右侧）。