可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):
问题:
I am trying to add a custom view in the center of a navigation bar and I am using the following code to test it:
UIView * testView = [[UIView alloc] init];
[testView setBackgroundColor:[UIColor blackColor]];
testView.frame = CGRectMake(0, 0, 100, 35);
[self.navigationController.navigationItem.titleView addSubview:testView];
I am setting this up in the viewDidLoad method of my view controller but when i run my program
nothing seems to change in my navigation bar.
Could you help me with this?
回答1:
This works. Give frame at the time of initialisation
UIView *iv = [[UIView alloc] initWithFrame:CGRectMake(0,0,32,32)];
[iv setBackgroundColor:[UIColor whiteColor]];
self.navigationItem.titleView = iv;
回答2:
If you want to just customize the title for one view controller you can use
UILabel *lblTitle = [[UILabel alloc] init];
lblTitle.text = @"Diga-nos o motivo";
lblTitle.backgroundColor = [UIColor clearColor];
lblTitle.textColor = [UIColor colorWithRed:77.0/255.0 green:77.0/255.0 blue:77.0/255.0 alpha:1.0];
lblTitle.shadowColor = [UIColor whiteColor];
lblTitle.shadowOffset = CGSizeMake(0, 1);
lblTitle.font = [UIFont fontWithName:@"HelveticaNeue-Bold" size:18.0];
[lblTitle sizeToFit];
self.navigationItem.titleView = lblTitle;
or if you want to customize for all view controllers use
[[UINavigationBar appearance] setTitleTextAttributes:
[NSDictionary dictionaryWithObjectsAndKeys:
[UIColor colorWithRed:255.0/255.0 green:255.0/255.0 blue:255.0/255.0 alpha:1.0],
UITextAttributeTextColor,
[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8],
UITextAttributeTextShadowColor,
[NSValue valueWithUIOffset:UIOffsetMake(0, -1)],
UITextAttributeTextShadowOffset,
[UIFont fontWithName:@"Arial-Bold" size:10.0],
UITextAttributeFont,
nil]];
回答3:
Replace
[self.navigationController.navigationItem.titleView addSubview:testView];
to
self.navigationItem.titleView = testView;
Edit:
Note: You cannot add subviews to titleView cause it's default value is nil
, you need to set a new view as the titleView.
回答4:
CustomLabel *titleLabel = [CustomLabel initWithLabelFrame:labelFrame textFont:[UIFont fontWithName:@"Helvetica" size:[UIFont systemFontSize]] textColor:[UIColor blackColor] labelText:@"Add as" textAlignment:NSTextAlignmentCenter labelOnView:reference.view labelTag:62];
[self.navigationItem setTitleView:titleLabel]; // titleLabel set in navigationItem
回答5:
You'll want to use storyboard to do this to support iPhone 6 and newer (larger) devices.
Create a container view for your custom navigation item title/subtitle etc, and drag it into the visual editor (not into the view hierarchy).
回答6:
#import <UIKit/UIKit.h>
@interface MasterViewController : UITableViewController
@end
#import "MasterViewController.h"
@interface MasterViewController ()
@end
@implementation MasterViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.titleView = [self titleView];
}
- (UIView *)titleView {
CGFloat navBarHeight = self.navigationController.navigationBar.frame.size.height;
CGFloat width = 0.95 * self.view.frame.size.width;
UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, navBarHeight)];
UIImage *logo = [UIImage imageNamed:@"logo.png"];
UIButton *logoButton = [UIButton buttonWithType:UIButtonTypeCustom];
CGFloat logoY = floorf((navBarHeight - logo.size.height) / 2.0f);
[logoButton setFrame:CGRectMake(0, logoY, logo.size.width, logo.size.height)];
[logoButton setImage:logo forState:UIControlStateNormal];
UIImage *bubble = [UIImage imageNamed:@"notification-bubble-empty.png"];
UIImageView *bubbleView = [[UIImageView alloc] initWithImage:bubble];
const CGFloat Padding = 5.0f;
CGFloat bubbleX =
logoButton.frame.size.width +
logoButton.frame.origin.x +
Padding;
CGFloat bubbleY = floorf((navBarHeight - bubble.size.height) / 2.0f);
CGRect bubbleRect = bubbleView.frame;
bubbleRect.origin.x = bubbleX;
bubbleRect.origin.y = bubbleY;
bubbleView.frame = bubbleRect;
[containerView addSubview:logoButton];
[containerView addSubview:bubbleView];
return containerView;
}
@end
回答7:
Swift 3
let myImageView = UIImageView(image: <...set your image...>)
override fun viewDidLoad(){
super.viewDidLoad()
self.navigationItem.titleView = myImageView //
}
One more alternate solution is
override fun viewWillAppear(_ animated: Bool) {
super. viewWillAppear(animated)
self.navigationItem.titleView = myImageView
}
I recommend to use, viewDidLoad
to setup your titleView
回答8:
Swift 3/4
You may set i.e. UILabel
as a titleView
. Call it in viewDidLoad()
:
private func setNavigationTitle(_ title: String) {
navigationItem.title = nil // clear the default title
let titleLabel = UILabel() // you don't need to specify a frame, it will be centred in the navbar
titleLabel.font = ...
titleLabel.textColor = ...
titleLabel.text = title
titleLabel.backgroundColor = .clear
navigationItem.titleView = titleLabel
navigationTitleView = titleLabel // you may create a property if you want to manipulate the title view later
}
Note navigationItem.title = nil
, otherwise title
may override titleView
.