添加左側(cè)右側(cè)button

UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 44, 44)];
    [btn addTarget:self action:@selector(myBtn:) forControlEvents:UIControlEventTouchUpInside];
    [btn setImage:[UIImage imageNamed:@"mx_btn_back_phone" ] forState:UIControlStateNormal];
    [btn setImage:[UIImage imageNamed:@"mx_btn_back_phone" ] forState:UIControlStateHighlighted];
    btn.imageEdgeInsets = UIEdgeInsetsMake(0, -31, 0, 0);
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
    self.navigationItem.leftBarButtonItem = backItem;
    self.navigationItem.rightBarButtonItem = backItem;

隨手筆記整理下！
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