iOS navigation Bar Customization button causes the click Range to be too big problem

In many app designs, the left/right side of the navigation bar will be designed to be an icon.
We usually take the form of creating a button:

    Create button
    UIButton *btn = [UIButton buttonwithtype:uibuttontypecustom];
    [Btn setimage:[uiimage imagenamed:@ "Nav_item_game_icon"] forstate:uicontrolstatenormal];
    [Btn setimage:[uiimage imagenamed:@ "Nav_item_game_click_icon"] forstate:uicontrolstatehighlighted];
    [Btn SizeToFit];

    Set the left button on the navigation bar
    self.navigationItem.leftBarButtonItem = [[Uibarbuttonitem alloc] initwithcustomview:btn];

This sets an icon button to the left of the navigation bar.

But there is a problem:

The clickable range of this button is also too large.

Solution: Package a UIView for UIButton

    Create button
    UIButton *btn = [UIButton buttonwithtype:uibuttontypecustom];
    [Btn setimage:[uiimage imagenamed:@ "Nav_item_game_icon"] forstate:uicontrolstatenormal];
    [Btn setimage:[uiimage imagenamed:@ "Nav_item_game_click_icon"] forstate:uicontrolstatehighlighted];
    [Btn SizeToFit];

    Pack the UIButton into Uibarbuttonitem there will be button clicks too big problem
    /solve this problem
    uiview *containview = [[UIView alloc] initWithFrame: Btn.bounds];
    [Containview addsubview:btn];

    Set the left button on the navigation bar
    self.navigationItem.leftBarButtonItem = [[Uibarbuttonitem alloc] initwithcustomview:containview];