// 1.加载storyboard
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"storyboard名称" bundle:nil];
// 2.初始化箭头指向的控制器
xxxxViewController *xxVC = [storyboard instantiateInitialViewController];
// 系统手势代理
@property (nonatomic, strong) id popGesture;
self.popGesture = self.interactivePopGestureRecognizer.delegate;
// 想统一设置返回按钮，滑动移除控制器
// 清空手势代理就能实现滑动返回，iOS6不支持
// 当是跟控制器，还原代理，如果是非跟控制器，清空代理
self.delegate = self;
// 当控制器显示完毕的时候调用
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
if (self.viewControllers[0] == viewController) {
// 根控制器
// 还原代理
self.interactivePopGestureRecognizer.delegate = self.popGesture;
} else {
// 非根控制器，清空代理
self.interactivePopGestureRecognizer.delegate = nil;
}
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
// 当非根控制器设置导航条左侧返回按钮
if (self.viewControllers.count > 1) {
// 设置导航条左侧返回按钮
viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage ImageNamed:@"XXX"] style:0 target:self action:@selector(back)];
}
}
- (void)back {
[self popViewControllerAnimated:YES];
}
// 设置导航条前景色
[bar setTintColor:[UIColor whiteColor]];
// 获取到导航条按钮的标识
UIBarButtonItem *item = [UIBarButtonItem appearanceWhenContainedIn:self, nil];
// 修改返回按钮标题的位置
[item setBackButtonTitlePositonAdjustment:UIOffsetMake(0, -100) forBarMetrics:UIBarMetricsDefault];
// 全屏滑动移除控制器
// 1.先修改系统的手势，系统没有给我们提供属性
UIScreenEdgePanGestureRecognizer *gest = self.interactivePopGestureRecognizer;
// 2.自己添加手势
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleNavigationTransition:)];
[self.view addGestureRecognizer:pan];
// 却Target 系统的私有属性
// KVC [gest valueForKeyPath:@""];
// 不知道 Target 真实类型
// OC runtime 机制 只能动态获取当前类的成员属性，不能获取其子类或者父类的属性<objc/runtime.h>
// __unsafe_unretained Class 要获取哪个类的成员属性
// unsigned int *outCount 获取Class 下面的所有成员属性的个数
unsigned int outCount = 0;
Ivar *ivars = class_copyIvarList([UIGestureRecognizer class], &outCount)
for (int i = 0; i < outCount; i++) {
// 获取成员属性的名字
NSString *name = @(ivar_getName(ivars[i]));
NSLog(@"%@", name);
}
// _targets
NSArray *targets = [gest valueForKeyPath:@"_targets"];
NSLog(@"%@", targets[0]);
id target = [targets[0] valueForKeyPath:@"_target"];
UIPanGestureRecognizer *pan1 = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan)];
[self.view addGestureRecognizer:pan1];
pan1.delegate = self;
id target = self.interactivePopGestureRecognizer.delegate;
// 2.自己添加手势
// 禁止系统的手势
self.interactivePopGestureRecognizer.enabled = NO;
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:target action:@selector(handleNavigationTransition:)];
[self.view addGestureRecognizer:pan];
pan.delegate = self;
// 当开始滑动的时候就会调用 如果返回YES，可以滑动
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
// 当是根控制器不让移除(禁止),非根控制器允许移除控制器
BOOL open = self.viewCintrollers.count > 1;
return open;
}
