NavigationBar上 左右button 的设置（作为自己的日志留存）

//此方法重在可以扩展。用户可以添加相关的设置信息。

//block；里面可以进一步添加一些执行相关代码。可以传入相关的string设置相关的BarButtonitem

方法1：

+ (UIBarButtonItem *)fc_createBarButton:(NSString *)title block:(BarButtonBlock)block
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:title forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [button setFrame:CGRectMake(0, 0, 50, 30)];
    [button addTarget:self action:@selector(invoke:) forControlEvents:UIControlEventTouchUpInside];
    
    button.block = block;
    
    UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:button];
    
    return item;

}

相关方法1：

+ (void)invoke:(UIButton *)bt
{
    bt.block();

}

//调用方法1：

- (void)createLeftTitle:(NSString *)left rightTitle:(NSString *)right leftblock:(BarButtonBlock)leftblock rightblock:(BarButtonBlock)rightblock
{
    if (left != nil) {
        self.navigationItem.leftBarButtonItem = [Function fc_createBarButton:left block:leftblock];
    }
    if (right != nil) {
        self.navigationItem.rightBarButtonItem = [Function fc_createBarButton:right block:rightblock];
    }
}