Ios 基于UIPangestureRecognitor转换值更改UIImageView中的图像

我在阵列中有8个图像，

UIImageView

一次显示阵列中的一个图像。我还有

UIImageView

上的

uipangestureerecognizer

，因此当用户在图像上横向移动手指时，手指会发生变化（类似于图像顶部的不可见滚动条）。我正在使用平移手势的平移值来更改图像。这一切都是可行的，但不是我想要的方式。图像变化太快，只需短手指在图像中滚动。是否有一种方法需要较长的平移时间来更改图像？或者其他任何让用户感觉更“流畅”的方法

h

m

@interface FirstViewController（）{
NSArray*图像阵列；
int currentIndex；
}
@结束
@FirstViewController的实现
-（iAction）pan：（UIPangEstureRecognitor*）panGesture{
//NSLog（@“平移”）；
CGPoint translation=[panGesture translationView:self.view]；
[self.panLabel setText:NSStringFromCGPoint（翻译）]；
NSLog（@“%@翻译”，NSStringFromCGPoint（翻译））；
如果（translation.x=7）？7:_currentIndex+1；
UIImage*img=[UIImage ImageName:[imageArray objectAtIndex:_currentIndex]；
[self.imageView setImage:img]；
}
[panGesture setTranslation:CGPointZero-inView:self.view]；
}
-（无效）viewDidLoad{
[超级视图下载]；
imageArray=[[NSArray alloc]
initWithObjects:@“image1.jpg”@“image2.jpg”@“image3.jpg”@“image4.jpg”@“image5.jpg”@“image6.jpg”@“image7.jpg”@“image8.jpg”，nil]；
}

您可以修改代码以随时间跟踪X平移。这将允许您为pan金额设置一个变量。修改后的代码如下：

@interface FirstViewController () {
    NSArray * imageArray;
    int _currentIndex;

    CGFloat _currentPanXAmount;
    CGFloat _panThreshold;
}

@end

@implementation FirstViewController

- (IBAction)pan:(UIPanGestureRecognizer *)panGesture {
    CGPoint translation = [panGesture translationInView:self.view];

    _currentPanXAmount += translation.x;

    [self.panLabel setText: NSStringFromCGPoint(translation)];
    NSLog(@"%@ translation", NSStringFromCGPoint(translation));

    if (_currentPanXAmount < (-1 * _panThreshold)) {
        _currentIndex=(_currentIndex<=0)?0:_currentIndex-1;
        UIImage *img = [UIImage imageNamed:[imageArray objectAtIndex:_currentIndex]];
        [self.imageView setImage:img];
        _currentPanXAmount = 0.0;
    }
    else if(_currentPanXAmount > _panThreshold){
        _currentIndex=(_currentIndex>=7)?7:_currentIndex+1;
        UIImage *img = [UIImage imageNamed:[imageArray objectAtIndex:_currentIndex]];
        [self.imageView setImage:img];
        _currentPanXAmount = 0.0;
    }
    [panGesture setTranslation:CGPointZero inView:self.view];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    imageArray = [[NSArray alloc]
                  initWithObjects:@"image1.jpg", @"image2.jpg", @"image3.jpg", @"image4.jpg", @"image5.jpg", @"image6.jpg", @"image7.jpg", @"image8.jpg", nil];

    // Make this larger for slower transitions and smaller for faster transitions.
    _panThreshold = 10.0;
}

@interface FirstViewController（）{
NSArray*图像阵列；
int currentIndex；
CGFloat _currentPanXAmount；
CGFloat_panThreshold；
}
@结束
@FirstViewController的实现
-（iAction）pan：（UIPangEstureRecognitor*）panGesture{
CGPoint translation=[panGesture translationView:self.view]；
_currentPanXAmount+=translation.x；
[self.panLabel setText:NSStringFromCGPoint（翻译）]；
NSLog（@“%@翻译”，NSStringFromCGPoint（翻译））；
如果（_currentPanXAmount<（-1*_panThreshold））{
_currentIndex=（\u currentIndex\u panThreshold）{
_currentIndex=（\u currentIndex>=7）？7:\u currentIndex+1；
UIImage*img=[UIImage ImageName:[imageArray objectAtIndex:_currentIndex]；
[self.imageView setImage:img]；
_currentPanXAmount=0.0；
}
[panGesture setTranslation:CGPointZero-inView:self.view]；
}
-（无效）viewDidLoad{
[超级视图下载]；
imageArray=[[NSArray alloc]
initWithObjects:@“image1.jpg”@“image2.jpg”@“image3.jpg”@“image4.jpg”@“image5.jpg”@“image6.jpg”@“image7.jpg”@“image8.jpg”，nil]；
//对于较慢的过渡，将其调大，对于较快的过渡，将其调小。
_panThreshold=10.0；
}

您可以修改代码以跟踪X平移时间。这将允许您为平移金额设置变量。修改后的代码如下：

@interface FirstViewController () {
    NSArray * imageArray;
    int _currentIndex;

    CGFloat _currentPanXAmount;
    CGFloat _panThreshold;
}

@end

@implementation FirstViewController

- (IBAction)pan:(UIPanGestureRecognizer *)panGesture {
    CGPoint translation = [panGesture translationInView:self.view];

    _currentPanXAmount += translation.x;

    [self.panLabel setText: NSStringFromCGPoint(translation)];
    NSLog(@"%@ translation", NSStringFromCGPoint(translation));

    if (_currentPanXAmount < (-1 * _panThreshold)) {
        _currentIndex=(_currentIndex<=0)?0:_currentIndex-1;
        UIImage *img = [UIImage imageNamed:[imageArray objectAtIndex:_currentIndex]];
        [self.imageView setImage:img];
        _currentPanXAmount = 0.0;
    }
    else if(_currentPanXAmount > _panThreshold){
        _currentIndex=(_currentIndex>=7)?7:_currentIndex+1;
        UIImage *img = [UIImage imageNamed:[imageArray objectAtIndex:_currentIndex]];
        [self.imageView setImage:img];
        _currentPanXAmount = 0.0;
    }
    [panGesture setTranslation:CGPointZero inView:self.view];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    imageArray = [[NSArray alloc]
                  initWithObjects:@"image1.jpg", @"image2.jpg", @"image3.jpg", @"image4.jpg", @"image5.jpg", @"image6.jpg", @"image7.jpg", @"image8.jpg", nil];

    // Make this larger for slower transitions and smaller for faster transitions.
    _panThreshold = 10.0;
}

@interface FirstViewController（）{
NSArray*图像阵列；
int currentIndex；
CGFloat _currentPanXAmount；
CGFloat_panThreshold；
}
@结束
@FirstViewController的实现
-（iAction）pan：（UIPangEstureRecognitor*）panGesture{
CGPoint translation=[panGesture translationView:self.view]；
_currentPanXAmount+=translation.x；
[self.panLabel setText:NSStringFromCGPoint（翻译）]；
NSLog（@“%@翻译”，NSStringFromCGPoint（翻译））；
如果（_currentPanXAmount<（-1*_panThreshold））{
_currentIndex=（\u currentIndex\u panThreshold）{
_currentIndex=（\u currentIndex>=7）？7:\u currentIndex+1；
UIImage*img=[UIImage ImageName:[imageArray objectAtIndex:_currentIndex]；
[self.imageView setImage:img]；
_currentPanXAmount=0.0；
}
[panGesture setTranslation:CGPointZero-inView:self.view]；
}
-（无效）viewDidLoad{
[超级视图下载]；
imageArray=[[NSArray alloc]
initWithObjects:@“image1.jpg”@“image2.jpg”@“image3.jpg”@“image4.jpg”@“image5.jpg”@“image6.jpg”@“image7.jpg”@“image8.jpg”，nil]；
//对于较慢的过渡，将其调大，对于较快的过渡，将其调小。
_panThreshold=10.0；
}

这正是我想要实现的目标。非常感谢！关于图像的前进方向：从右向左平移时，从8--->1。必须反转“if语句”以获得更直观的“滚动”。您还缺少一个括号，我正在编辑该括号。@robhasacamera currentIndex=（currentIndex>=7）？7:currentIndex+1；如何翻译这是swift2？这正是我试图实现的。非常感谢！关于图像的前进方向：从右向左平移时，从8--->1“如果语句”必须颠倒，才能更直观地“滚动”。此外，您还缺少一个括号，我现在正在编辑该括号。@robhasacamera currentIndex=（currentIndex>=7）？7:currentIndex+1；如何翻译这是swift2？

@interface FirstViewController () {
    NSArray * imageArray;
    int _currentIndex;

    CGFloat _currentPanXAmount;
    CGFloat _panThreshold;
}

@end

@implementation FirstViewController

- (IBAction)pan:(UIPanGestureRecognizer *)panGesture {
    CGPoint translation = [panGesture translationInView:self.view];

    _currentPanXAmount += translation.x;

    [self.panLabel setText: NSStringFromCGPoint(translation)];
    NSLog(@"%@ translation", NSStringFromCGPoint(translation));

    if (_currentPanXAmount < (-1 * _panThreshold)) {
        _currentIndex=(_currentIndex<=0)?0:_currentIndex-1;
        UIImage *img = [UIImage imageNamed:[imageArray objectAtIndex:_currentIndex]];
        [self.imageView setImage:img];
        _currentPanXAmount = 0.0;
    }
    else if(_currentPanXAmount > _panThreshold){
        _currentIndex=(_currentIndex>=7)?7:_currentIndex+1;
        UIImage *img = [UIImage imageNamed:[imageArray objectAtIndex:_currentIndex]];
        [self.imageView setImage:img];
        _currentPanXAmount = 0.0;
    }
    [panGesture setTranslation:CGPointZero inView:self.view];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    imageArray = [[NSArray alloc]
                  initWithObjects:@"image1.jpg", @"image2.jpg", @"image3.jpg", @"image4.jpg", @"image5.jpg", @"image6.jpg", @"image7.jpg", @"image8.jpg", nil];

    // Make this larger for slower transitions and smaller for faster transitions.
    _panThreshold = 10.0;
}