Adding button to left of UISearchBar

问题:

I am tearing my hair out on this one. My client wants to add a button to the left of a search bar like the example below:

alt text http://www.erik.co.uk/images/IMG_0008.PNG

But I just can't figure out how to do it. Apple don't seem to provide any documented method for adding custom buttons to a UISearchBar, let alone to the left of the search bar.

I've tried hacking around in Interface Builder adding a UIToolbar with a button in it to the left but I cannot find any combination of styles where the two line up properly to give the impression that they are one. There is always what looks like one pixel difference in the vertical alignment as you can see from the picture below:

alt text http://www.erik.co.uk/images/verticalalignment.png

I've searched around and just can't find the answer, but as we can see from the screenshot it must be possible!

Thank you in advance for your help.

Erik

回答1:

Use a navigation bar instead of a toolbar. Set the search bar to the navigation bar's title view.

In Interface Builder:

Result:

回答2:

You can replace the Bookmark image instead, and adjust its offset if necessary.
For example:

[self.searchDisplayController.searchBar setImage:[UIImage imageNamed:@"plus2"] forSearchBarIcon:UISearchBarIconBookmark state:UIControlStateNormal];
[self.searchDisplayController.searchBar setPositionAdjustment:UIOffsetMake(-10, 0) forSearchBarIcon:UISearchBarIconBookmark];

Handle the button event in the delegate method:

- (void)searchBarBookmarkButtonClicked:(UISearchBar *)searchBar

This is how it looks:

回答3:

The first solution is to use UINavigationBar instead of UIToolbar, as KennyTM noticed. But you may not be satisfied with Navigation bar, like in my case, when I need to use 3 buttons (Navigation bar is allow to use only 2 buttons) - see the left picture. This is how I did it:

1. Use Toolbar with 3 buttons and Flexible Space Bar Button Item in the place where search bar should be placed.
2. Put search bar on (not in) the toolbar. To do so in Interface Builder, do not drag & drop the search bar on the toolbar. Instead, put it somewhere nearby and then move it to place using the arrow keys on the keyboard (or by changing X & Y position in Interface Builder).
3. Search bar left black line under it (see the right picture). To hide it I put one additional view with the height 1px and a white background over it.

It looks a bit dirty for me, so if you have a better solution, let me know.

回答4:

The easiest solution is to add your SearchBar in TOP of your Toolbar, (not in), I give you the best solution I use in my company eBuildy:

UIBarButtonItem *mySettingsButton = [[UIBarButtonItem alloc] initWithTitle:@"Settings" style:UIBarButtonItemStyleBordered target:self action:@selector(refresh)];
UIBarButtonItem *mySpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *myRefreshButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(refresh)];
UIToolbar *myTopToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0,0,320,40)];
UISearchBar *mySearchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(70,1,220,40)];

[myTopToolbar setItems:[NSArray arrayWithObjects:mySettingsButton,mySpacer,myRefreshButton, nil] animated:NO];
[self.view addSubview:myTopToolbar];
[self.view addSubview:mySearchBar];

回答5:

answering an old question here but i was struggling with this one myself recently and found some shortcomings with the other answers for the situation i was trying to address. here's what i did in a subclass of UISearchBar:

first add a UIButton property (here "selectButton"). then override the initWithFrame method and do something similar to the following:

-(id)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame:frame])
{
    self.selectButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    self.selectButton.contentEdgeInsets = (UIEdgeInsets){.left=4,.right=4};
    [self.selectButton addTarget:self action:@selector(pressedButton:) forControlEvents:UIControlEventTouchUpInside];

    self.selectButton.titleLabel.numberOfLines = 1;
    self.selectButton.titleLabel.adjustsFontSizeToFitWidth = YES;
    self.selectButton.titleLabel.lineBreakMode = UILineBreakModeClip;

    [self addSubview:self.selectButton];
    [self.selectButton setFrame:CGRectMake(5, 6, 60, 31)];
}

return self;
}

Now you want to override the layout subviews method to resize the searchbar to the appropriate width, depending on whether or not the cancel button is showing. That should look something like this:

-(void)layoutSubviews
{
[super layoutSubviews];

float cancelButtonWidth = 65.0;
UITextField *searchField = [self.subviews objectAtIndex:1];

if (self.showsCancelButton == YES)
    [searchField setFrame:CGRectMake(70, 6, self.frame.size.width - 70 - cancelButtonWidth, 31)];
else
    [searchField setFrame:CGRectMake(70, 6, self.frame.size.width - 70, 31)];
}

Note that in the above method I added a constant for the cancelButtonWidth. I tried adding code to get the width from [self cancelButton] but that seems only accessible at runtime and doesn't allow the project to compile. In any case this should be a good start for what you need

回答6:

If you want a custom button on the right, taking place of the Cancel button, just use this code (valid for iOS 9 and up):

[self.searchBar setShowsCancelButton:YES];
[[UIBarButtonItem appearanceWhenContainedIn:[self.searchBar class], nil] setTitle:@""];
[[UIBarButtonItem appearanceWhenContainedIn:[self.searchBar class], nil] setImage:[UIImage imageNamed:@"search"]];