iOS 调整导航栏返回按钮的位置

调整导航栏返回按钮的位置

//创建返回按钮
UIButton * leftBtn = [UIButton buttonWithType:UIButtonTypeSystem];
leftBtn.frame = CGRectMake(0, 0, 25,25);
[leftBtn setBackgroundImage:[UIImage imageNamed:@"icon_back"] forState:UIControlStateNormal];
[leftBtn addTarget:self action:@selector(leftBarBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem * leftBarBtn = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];;
//创建UIBarButtonSystemItemFixedSpace
UIBarButtonItem * spaceItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
//将宽度设为负值
spaceItem.width = -15;
//将两个BarButtonItem都返回给NavigationItem
self.navigationItem.leftBarButtonItems = @[spaceItem,leftBarBtn];