【www.bbyears.com--ios】
1.自定义按钮
代码如下 //左按钮UIButton *leftBtn = [[UIButton alloc]initWithFrame:RectWithPara(-20, 0, 44, 44)];
[leftBtn addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];//设置按钮点击事件
[leftBtn setBackgroundImage:ImageNamed(@"ic_fanhui_normal.png") forState:UIControlStateNormal ];//设置按钮正常状态图片
[leftBtn setBackgroundImage:ImageNamed(@"ic_fanhui_pressed.png") forState:UIControlStateSelected];//设置按钮选中图片
2.初始化UIBarButtonItem
3.调整位置以及设置导航栏的左边图标
if(([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0?20:0))
{
UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
target:nil action:nil];
negativeSpacer.width = -20;//这个数值可以根据情况自由变化
self.navigationItem.leftBarButtonItems = @[negativeSpacer, leftBarButon];
}else
self.navigationItem.leftBarButtonItem = leftBarButon;