导航栏按钮偏移问题.m

if(([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0?20:0)){
    UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemFixedSpace target:nil action:nil];
    negativeSpacer.width = -10;//这个数值可以根据情况自由变化
    self.navigationItem.rightBarButtonItems = @[negativeSpacer,itemAdd, itemSearch];
} else {
    self.navigationItem.rightBarButtonItems = @[itemAdd, itemSearch];
}