UINavigationBar with two buttons on the left

问题:

I know that on stackoverflow there are many similar questions but mine is a little different. I'll show this with images, because it's easier to understand. Using this code I took from here, I had this result:

It's easy to see that the second button isn't all on the screen. I tried to but negative numbers in the UIToolbar frame but they don't work. I don't need any title there, only a way to move these buttons to the left.

回答1:

Here is a different approach. I created a custom segmented control (github link) as a UIView containing several buttons. You could do the same with a space between buttons.

Then I added that as a single button item with a custom view.

CGRect frame = CGRectMake(320-width, 0, width, height);
[segControl.view setFrame:frame];
segControl.view.backgroundColor = [UIColor clearColor];
UIBarButtonItem *rightBtn = [[UIBarButtonItem alloc] initWithCustomView:segControl.view];
self.navigationItem.rightBarButtonItem = rightBtn;

The result is able to expand closer to the middle:

Answering the comment below: yes, it's independent.

回答2:

What's your deadline? This functionality is added in iOS5, so if you're going to release your app after (correct me if I'm wrong) september you can switch your app to the new UIKit. You will lose backwards-compability to <= iOS4 though.

回答3:

 UIToolbar *tool = [UIToolbar new];
    tool.frame = CGRectMake(0, 0, 320, 42);
    //tool.frame = self.navigationController.navigationBar.frame;   
    NSMutableArray *items = [[NSMutableArray alloc] initWithCapacity:7];
    //space

    UIBarButtonItem *btn3;
     btn3 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
     UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
     [items addObject:btn3];
     [btn3 release];


    //create setting button
    UIButton *bttn=[[UIButton alloc]initWithFrame:CGRectMake(45, 0, 20, 30)];
    [bttn setImage:[UIImage imageNamed:@"settings.png"] forState:UIControlStateNormal];
    [bttn addTarget:self action:@selector(settings:) forControlEvents:UIControlEventTouchDown];
    UIBarButtonItem *btn1=[[UIBarButtonItem alloc]initWithCustomView:bttn];
    [items addObject:btn1];
    [btn1 release];


    UIBarButtonItem *btn = [[UIBarButtonItem alloc] init];

    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];


    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];
    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];

    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];

    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];



    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];



    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
               UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];

    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace   target:nil action:nil];
    [items addObject:btn];
    [btn release];


    //pause Button
    UIButton *bttn1=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 20, 30)];
    [bttn1 setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
    [bttn1 addTarget:self action:@selector(pause:) forControlEvents:UIControlEventTouchDown];
    //UIBarButtonItem *btn2=[[UIBarButtonItem alloc]initWithCustomView:bttn1];
    btnPause = [[UIBarButtonItem alloc]initWithCustomView:bttn1];
    [items addObject:btnPause];
    //[btn2 release];

    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
                               UIBarButtonSystemItemFlexibleSpace  target:nil action:nil];
    [items addObject:btn];
    [btn release];

    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace  target:nil action:nil];
    [items addObject:btn];
    [btn release];
    //Space
    btn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
           UIBarButtonSystemItemFlexibleSpace  target:nil action:nil];
    [items addObject:btn];
    [btn release];

    //Next Button
    btnNext = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
               UIBarButtonSystemItemPlay  target:self action:@selector(next:)];
    [items addObject:btnNext];


    [tool setItems:items];
    tool.barStyle =UIBarStyleDefault;
    tool.backgroundColor = [UIColor clearColor];

    //self.navigationItem.leftBarButtonItem.customView = tool;
    //self.navigationItem.titleView = tool;
    self.navigationItem.leftBarButtonItem =  [[UIBarButtonItem alloc] initWithCustomView:tool];

use this method to display more buttons in toolbar with navigation.