我正在尝试在所有屏幕大小的几个视图之间添加垂直视差滚动效果。通过按钮完成并不太复杂，但是我希望它可以由UIPanGesture控制，类似于iOS的Year Walk Companion App。目前这里显示的方程式不能正常工作。目前这个版本只移动了前两个视图，因为一旦我让它们工作起来，其余的就应该很容易了。我还没有包含所有检查，以防止某些视图在某些方向上移动，因为这也与问题无关。这是一个使用按钮工作的Web版本：http://flycarpodacus.zxq.net/iPhone%20Parallax/event.html 希望有人能帮忙。
ViewController.h
@interface ViewController : UIViewController {
UIPanGestureRecognizer *panGesture;
int activeView;
int nextView;
float offset;
float speed;
}
@property (weak, nonatomic) IBOutlet UIView *view1;
@property (weak, nonatomic) IBOutlet UIView *view2;
@property (weak, nonatomic) IBOutlet UIView *view3;
@property (weak, nonatomic) IBOutlet UIView *view4;
ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize view1, view2, view3, view4;
- (void)viewDidLoad
{
[super viewDidLoad];
activeView = 1;
offset = 220;
speed = 1;
panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
[self.view addGestureRecognizer:panGesture];
if (self.view.frame.size.height != 568) {
CGRect frame = self.view.frame;
frame.size.height = self.view.frame.size.height;
view1.frame = frame;
view2.frame = frame;
view3.frame = frame;
view4.frame = frame;
}
view4.center = CGPointMake(view4.center.x, self.view.frame.size.height/2 + offset);
view3.center = CGPointMake(view3.center.x, self.view.frame.size.height/2 + offset);
view2.center = CGPointMake(view2.center.x, self.view.frame.size.height/2 + offset);
view1.center = CGPointMake(view1.center.x, self.view.frame.size.height/2);
}
- (void)handlePanGesture:(UIPanGestureRecognizer *)panGestureRecognizer {
CGPoint panGestureTranslation = [panGestureRecognizer translationInView:self.view];
switch (activeView) {
case 1:
view1.center = CGPointMake(view1.center.x, panGestureTranslation.y + self.view.frame.size.height/2);
view2.center = CGPointMake(view2.center.x, view2.center.y - 2.5f);
break;
default:
break;
}
}