Simulator Screen Shot - iPhone Xʀ - 2019-07-04 at 21.53.09.png
期初是通过向collectionView的cell中addSubview，并且通过设置ContenOffset或者ScrollToItem的形式实现,
但是遇到了一些问题，比如
1.子视图控制器的···viewWillAppear和viewWillDisappear···方法不会调用
后又通过addChildViewController的方式实现
1、创建子视图控制器数组，并且向其中添加元素
[self.childVcAry addObject:childVc];
设置好每一个childVc的view的frame
childVc.view.frame = CGRectMake(0, 100, ScreenWitdh, ScreenHeight - 100);
2.先向self.view中添加第一个子视图控制器(addChildViewController)
ChildViewController *firstVc = self.childVcAry.firstObject;
firstVc.label.text = @"0";
[self addChildViewController:firstVc];
self.currentChildVc = firstVc;
[firstVc didMoveToParentViewController:self];
[self.view addSubview:firstVc.view];
3.切换子视图控制器
- (void)changeVCWithOld:(ChildViewController *)oldController
newController:(ChildViewController *)newController {
if (![self.currentChildVc isEqual:newController]) {
[self addChildViewController:newController];
[self transitionFromViewController:oldController toViewController:newController duration:0.3 options:(UIViewAnimationOptionShowHideTransitionViews) animations:^{
} completion:^(BOOL finished) {
if (finished) {
[newController didMoveToParentViewController:self];
[oldController willMoveToParentViewController:nil];
[oldController removeFromParentViewController];
self.currentChildVc = newController;
}
}];
}
}
···完整代码如下
#define ScreenWitdh [UIScreen mainScreen].bounds.size.width
#define ScreenHeight [UIScreen mainScreen].bounds.size.height
@interface ChildViewController : UIViewController
@property (nonatomic, strong) UILabel *label;
@end
@implementation ChildViewController
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.label = [[UILabel alloc] init];
self.label.textColor = [UIColor redColor];
self.label.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:self.label];
[self.label mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.mas_equalTo(UIEdgeInsetsZero);
}];
}
@end
@interface ViewController ()
@property (nonatomic, strong) NSMutableArray <ChildViewController *>*childVcAry;
@property (nonatomic, strong) ChildViewController *currentChildVc;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.childVcAry = [NSMutableArray array];
CGFloat itemWidth = ScreenWitdh / 4;
for (NSInteger idx = 0 ; idx < 4; idx ++ ) {
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(itemWidth * idx, 0,itemWidth , 100);
button.tag = idx;
[button setTitle:[@(idx) stringValue] forState:UIControlStateNormal];
[button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[button setTitleColor:[UIColor grayColor] forState:UIControlStateSelected];
button.adjustsImageWhenHighlighted = NO;
[button addTarget:self action:@selector(handleButtonClick:) forControlEvents:UIControlEventTouchUpInside];
button.selected = idx == 0;
[self.view addSubview:button];
ChildViewController *childVc = [[ChildViewController alloc] init];
childVc.label.text = [@(idx) stringValue];
childVc.view.frame = CGRectMake(0, 100, ScreenWitdh, ScreenHeight - 100);
[self.childVcAry addObject:childVc];
}
ChildViewController *firstVc = self.childVcAry.firstObject;
firstVc.label.text = @"0";
[self addChildViewController:firstVc];
self.currentChildVc = firstVc;
[firstVc didMoveToParentViewController:self];
[self.view addSubview:firstVc.view];
UIPanGestureRecognizer *panGes = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGes:)];
[self.view addGestureRecognizer:panGes];
}
- (void)handlePanGes:(UIPanGestureRecognizer *)panGes {
static CGPoint startPoint;
static CGPoint currentPoint;
switch (panGes.state) {
case UIGestureRecognizerStateBegan:{
startPoint = [panGes translationInView:self.currentChildVc.view];
currentPoint = [panGes translationInView:self.currentChildVc.view];
}
break;
case UIGestureRecognizerStateChanged:
{
currentPoint = [panGes translationInView:self.currentChildVc.view];
}break;
case UIGestureRecognizerStateEnded:
{
CGPoint endPoint = [panGes translationInView:self.currentChildVc.view];
CGFloat xChange = endPoint.x - startPoint.x;
CGFloat yChange = endPoint.y - startPoint.y;
if (fabs(yChange) < 30) {
if (fabs(xChange) > 30) {
NSInteger currentIndex = [self.childVcAry indexOfObject:self.currentChildVc];
NSInteger oldIndex = currentIndex;
currentIndex -= xChange / fabs(xChange);
currentIndex = MAX(currentIndex, 0);
currentIndex = MIN(currentIndex, self.childVcAry.count -1);
ChildViewController *oldController = self.childVcAry[oldIndex];
oldController.label.text = [@(oldIndex) stringValue];
ChildViewController *newController = self.childVcAry[currentIndex];
newController.label.text = [@(currentIndex) stringValue];
[self changeVCWithOld:oldController newController:newController];
}
}
}
break;
}
}
- (void)handleButtonClick:(UIButton *)button {
static UIButton *currentButton;
if (currentButton != button) {
[self.view.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
if ([obj isKindOfClass:[UIButton class]]) {
[(UIButton *)obj setSelected:[button isEqual:obj]];
}
}];
NSInteger idx = button.tag;
ChildViewController *newController = self.childVcAry[idx];
newController.label.text = [@(idx) stringValue];
[self changeVCWithOld:self.currentChildVc newController:newController];
} else {
}
currentButton = button;
}
- (void)changeVCWithOld:(ChildViewController *)oldController
newController:(ChildViewController *)newController {
if (![self.currentChildVc isEqual:newController]) {
[self addChildViewController:newController];
[self transitionFromViewController:oldController toViewController:newController duration:0.3 options:(UIViewAnimationOptionShowHideTransitionViews) animations:^{
} completion:^(BOOL finished) {
if (finished) {
[newController didMoveToParentViewController:self];
[oldController willMoveToParentViewController:nil];
[oldController removeFromParentViewController];
self.currentChildVc = newController;
}
}];
}
}
能够通过简单手势实现左右切换，但是并未添加类似scrollView的动画，假如您有任何问题，欢迎指出！
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