iOS 7自定义后退按钮
我想使用自定义后退按钮。在iOS 6中，一切都很完美，但iOS 7却很奇怪iOS 7自定义后退按钮,ios,cocoa-touch,ios7,xcode5,Ios,Cocoa Touch,Ios7,Xcode5,我想使用自定义后退按钮。在iOS 6中，一切都很完美，但iOS 7却很奇怪 [[UIBarButtonItem appearance] setBackButtonBackgroundImage:[[UIImage imageNamed:@"back_button_normal"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12.0, 0, 12.0)] forState:UIControlStateNormal barMetrics:UIBa
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:[[UIImage imageNamed:@"back_button_normal"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12.0, 0, 12.0)] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
UIControlStateHighlightedios7UIBarButtonItemself.navigationItem.backBarButtonItem=barButtonItem没有帮助。
然后我尝试将背景图像设置为禁用状态，并更改我的工具栏按钮项的enabled属性，但也没有帮助
这不是一个bug，这是iOS 7中后退按钮的外观。例如：
您可能应该在应用程序中使用新概念，而不是在iOS 7中为后退按钮设置背景图像
如果您仍然希望后退按钮与iOS6中的相同，那么您可能应该手动创建这些后退按钮：
- (void)loadView
{
[super loadView];
UIButton *backButton = [[UIButton alloc] initWithFrame: CGRectMake(0, 0, 60.0f, 30.0f)];
UIImage *backImage = [[UIImage imageNamed:@"back_button_normal.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12.0f, 0, 12.0f)];
[backButton setBackgroundImage:backImage forState:UIControlStateNormal];
[backButton setTitle:@"Back" forState:UIControlStateNormal];
[backButton addTarget:self action:@selector(popBack) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = backButtonItem;
}
-(void) popBack {
[self.navigationController popViewControllerAnimated:YES];
}
编辑：不要打断滑动手势(
self.navigationController.interactiveepgpgestureerecognizer.delegate=（id）self；
第一次推送时未出现的自定义背景图像已在iOS 7 GM中修复
要隐藏标准背面指示器，请使用以下代码：
if ([UINavigationBar instancesRespondToSelector:@selector(setBackIndicatorImage:)]) { // iOS 7
[navigationBarAppearance setBackIndicatorImage:[UIImage imageNamed:@"transparent_1px"]];
[navigationBarAppearance setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"transparent_1px"]];
}
据我所知，最初没有出现的自定义背景图像在iOS7 GM或final中没有修复。我看到了同样的问题。这似乎是一个Apple错误；Apple使用的私有视图在初始显示时根本没有得到setNeedsDisplay调用。对它做任何导致调用的操作都应该修复它——就像pre一样打开它（这可能会更改内部状态，以便它自己调用setNeedsDisplay），或者打开一个模式（这可能会强制在下一个视图上重新显示整个视图层次结构：call）
使用leftBarItems也可以工作，但这可能会导致现有代码的许多维护问题（例如，一些屏幕可能有自己的左侧项，期望当设置回nil时，它们会恢复原始的back项）
如前所述，理想情况下，您可以在iOS7上更改为无边界外观，这意味着错误并不明显（因为没有背景图像）。但是对于某些iOS6/iOS7转换情况，这可能会很困难（很多屏幕，和/或需要支持较旧的iOS版本一段时间，很难实现两种外观，如果没有其他更改，它看起来就不好无边框）。如果是这样，以下补丁应该可以工作：
#import <objc/runtime.h>
@implementation UINavigationBar (BackButtonDisplayFix)
+ (void)load
{
if ([UIDevice currentDevice].systemVersion.intValue >= 7)
{
/*
* We first try to simply add an override version of didAddSubview: to the class. If it
* fails, that means that the class already has its own override implementation of the method
* (which we are expecting in this case), so use a method-swap version instead.
*/
Method didAddMethod = class_getInstanceMethod(self, @selector(_displaybugfixsuper_didAddSubview:));
if (!class_addMethod(self, @selector(didAddSubview:),
method_getImplementation(didAddMethod),
method_getTypeEncoding(didAddMethod)))
{
Method existMethod = class_getInstanceMethod(self, @selector(didAddSubview:));
Method replacement = class_getInstanceMethod(self, @selector(_displaybugfix_didAddSubview:));
method_exchangeImplementations(existMethod, replacement);
}
}
}
- (void)_displaybugfixsuper_didAddSubview:(UIView *)subview
{
[super didAddSubview:subview];
[subview setNeedsDisplay];
}
- (void)_displaybugfix_didAddSubview:(UIView *)subview
{
[self _displaybugfix_didAddSubview:subview]; // calls the existing method
[subview setNeedsDisplay];
}
@end
#导入
@实现UINavigationBar（BackButtonDisplayFix）
+（空）荷载
{
如果（[UIDevice currentDevice].systemVersion.intValue>=7）
{
/*
*我们首先尝试简单地向类添加didAddSubview:的覆盖版本
*失败，这意味着该类已经拥有自己的方法重写实现
*（我们在本例中希望如此），因此请改用方法交换版本。
*/
Method didAddMethod=class_getInstanceMethod（self，@selector（_displaybugfixsuper_didAddSubview:）；
如果（！class_addMethod（self，@selector（didAddSubview:），
方法_getImplementation（didAddMethod），
方法\u getTypeEncoding（didAddMethod）））
{
方法existMethod=class_getInstanceMethod（self，@selector（didAddSubview:）；
方法替换=class_getInstanceMethod（self，@selector（_displaybugfix_didAddSubview:）；
方法交换实施（现有方法，替换）；
}
}
}
-（无效）_displaybugfixsuper_didAddSubview:（UIView*）子视图
{
[超级添加子视图：子视图]；
[子视图设置需要显示]；
}
-（无效）\u displaybugfix\u didAddSubview:（UIView*）子视图
{
[self _displaybugfix_didAddSubview:subview]；//调用现有方法
[子视图设置需要显示]；
}
@结束
注意：UINavigationBar目前确实有一个对所讨论方法的覆盖，所以我希望使用方法交换实现风格。为了安全起见，我刚刚添加了其他东西，以防苹果更改其代码。我们自己可能会去无边界，但我确实发现这种方法可以作为一种选择（直到更彻底的UI升级）至少
附加说明：此错误似乎在iOS 7.1中已修复。因此，该修补程序可能被限制为仅在运行>=7.0和<7.1时安装这些方法。在iOS 7中添加按钮作为导航项，如下所示
UIButton *btnAdd = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 60, 30)];
[btnAdd setContentMode:UIViewContentModeScaleAspectFit];
[btnAdd setBackgroundImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];
[btnAdd addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *btnAdd = [[UIBarButtonItem alloc] initWithCustomView:imView];
self.navigationItem.rightBarButtonItem = btnAdd;
有一个更好的解决方案，它不涉及方法切换
您需要在应用程序中的某个位置添加UINavigationViewControllerDelegate方法
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
dispatch_async(dispatch_get_main_queue(), ^{
[[navigationController.navigationBar subviews] makeObjectsPerformSelector:@selector(setNeedsDisplay)];
});
}我只是提供了与iOS6相同的行为（注意navigationBar是UINavigationBar），确保navigationBar有一个topItem
UINavigationItem *topItemNavigation = [navigationBar topItem];
UIBarButtonItem *barButtonTopItemNavigation = [[UIBarButtonItem alloc] initWithTitle:topItemNavigation.title style:UIBarButtonItemStyleBordered target:nil action:nil];
[barButtonTopItemNavigation setBackButtonBackgroundImage:YOUR_IMAGE_BACKGROUND forState:UIControlStateNormal barMetrics:UIBarMetricsDefault ];
[topItemNavigation setBackBarButtonItem: barButtonTopItemNavigation];
}
我的解决方案是在UINavigationItem上写一个类别。这是针对iOS7的
- (void)mdSetCustomBackButton:(UINavigationController *)navigationController
{
MDBackButton *backButton = [[MDBackButton alloc] initWithFrame:CGRectMake(0.0, 0.0, 44.0, 44.0) navigationController:navigationController];
[backButton addTarget:self action:@selector(popBack:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
[self setLeftBarButtonItem:barButtonItem];
[navigationController.interactivePopGestureRecognizer setDelegate:(id<UIGestureRecognizerDelegate>)self];
}
- (void)popBack:(MDBackButton *)sender
{
[sender.navigationController popViewControllerAnimated:YES];
}
我的解决方案适用于iOS 7及以上版本
首先，使默认的后退按钮不可见
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
然后，使用自定义图像设置后退按钮的默认backindicatormage
[UINavigationBar appearance].backIndicatorImage = [[UIImage imageNamed:@"topbar_icon_back_n.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
[UINavigationBar appearance].backIndicatorTransitionMaskImage = [[UIImage imageNamed:@"topbar_icon_back_p.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
此时，制作自定义的UINavigationBar
，用于调整的大小\u UINavigationBarBackIndicatorView
，其中包含上述背景指示符号图像
const CGPoint SANavigationBarOffset = {-8, 11.5};
@implementation SANavigationBar
- (void)layoutSubviews
{
[super layoutSubviews];
// set back button position
NSArray *classNamesToReposition = @[@"_UINavigationBarBackIndicatorView"];
for (UIView *view in [self subviews]) {
if ([classNamesToReposition containsObject:NSStringFromClass([view class])]) {
CGRect frame = [view frame];
frame.origin.x = 0;
frame.origin.y = 0;
[view setFrame:frame];
}
}
}
@end
然后，将其设置为我的导航栏
// set custom NavagationBar for back button position
[self.navigationController setValue:[[SANavigationBar alloc] init] forKey:@"navigationBar"];
这是我的工作：
- (void)setCustomNavigationBackButton
{
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
UIImage *myIcon = [self imageWithImage:[UIImage imageNamed:@"backbutton.png"] scaledToSize:CGSizeMake(20, 20)];
self.navigationController.navigationBar.backIndicatorImage = myIcon;
self.navigationController.navigationBar.backIndicatorTransitionMaskImage = myIcon;
}
- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize
{
//UIGraphicsBeginImageContext(newSize);
// In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).
// Pass 1.0 to force exact pixel size.
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
另外，使用自定义颜色的自定义字体：
//self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
[[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTitleTextAttributes:
@{NSForegroundColorAttributeName:[UIColor whiteColor],
NSFontAttributeName:[UIFont fontWithName:@"Signika-Bold" size:20]}
forState:UIControlStateNormal];
参考资料：使用Swift，您只需添加一个扩展名：
extension UIViewController: UIGestureRecognizerDelegate {
func popBack() {
self.navigationController?.popViewControllerAnimated(true)
}
func enableCustomBackButtom() {
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(named: "icon-back"), style: UIBarButtonItemStyle.Plain, target: self, action:"popBack")
self.navigationController?.interactivePopGestureRecognizer.delegate = self
}
}
在UIViewController中，使用以下命令：
self.enableCustomBackButtom()
我用这些c
//self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
[[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTitleTextAttributes:
@{NSForegroundColorAttributeName:[UIColor whiteColor],
NSFontAttributeName:[UIFont fontWithName:@"Signika-Bold" size:20]}
forState:UIControlStateNormal];
extension UIViewController: UIGestureRecognizerDelegate {
func popBack() {
self.navigationController?.popViewControllerAnimated(true)
}
func enableCustomBackButtom() {
self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(named: "icon-back"), style: UIBarButtonItemStyle.Plain, target: self, action:"popBack")
self.navigationController?.interactivePopGestureRecognizer.delegate = self
}
}
self.enableCustomBackButtom()
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.translatesAutoresizingMaskIntoConstraints = NO;
button.exclusiveTouch = YES;
button.titleLabel.font = [UIFont systemFontOfSize:14.0];
[button setTitleColor:kWhiteColor forState:UIControlStateNormal];
[button setTitleColor:[UIColor colorWithRed:1/255.0 green:36/255.0 blue:60/255.0 alpha:1.0] forState:UIControlStateHighlighted];
[button setTitle:@"Back" forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"barbutton_back"] forState:UIControlStateNormal];
[button setImageEdgeInsets:UIEdgeInsetsMake(1.0, 0.0, 0.0, 0.0)];
CGSize fontSize = [button.titleLabel sizeThatFits:CGSizeMake(100.0, 30.0)];
button.frame = CGRectMake(0.0, 0.0, button.imageView.image.size.width+fontSize.width, 30.0);
UIBarButtonItem *barbtn = [[UIBarButtonItem alloc] initWithCustomView:button];
//fix iOS 7 left margin
UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
negativeSpacer.width = -10;
self.navigationItem.leftBarButtonItems = [NSArray arrayWithObjects:negativeSpacer,barbtn, nil];