iPhone在导航栏中添加项目/行按钮

Question

Is there a standard way to implement a button like the one below in a navigation bar? If not I can, of course, just use an image or maybe a custom view but as it's used in quite a few apps I thought there may be a method I'm missing.

Answer 1

UIBarButtonItem *barBtnItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(add:)];

self.navigationItem.rightBarButtonItem=barBtnItem;
        [barBtnItem release];

this code use for creating + button.

Answer 2

那是标准的UIBarButtonSystemItem系统图标（ UIBarButtonSystemItemAdd ）之一-看一下UIBarButtonItem类参考中的initWithBarButtonSystemItem:target:action:方法。