ios Horizo​​ntal UISlider导致UIPageViewController在不打算时滑动页面

Question

网页浏览中的单个或多个水平滑块会带来麻烦.用户滑动滑块的拇指而不会导致页面视图滑动.

我尝试过的变通方法

1. 重写Pan Gesture以使最小速度相关
2. 在滑块上放置一个不可见的矩形来捕捉平移手势
3. 重写HitTest以使拇指点击矩形更大

Answer 1

到目前为止,最好的结果是在自定义扩展UISlider类中覆盖了Pan Gesture.会发生什么是在UISlider矩形中的任何地方检测到Pan Gesture而不仅仅是拇指.现在坚如磐石,没有翻页浏览.

注意:提供了initWithFrame和initWithCoder,因此可以通过代码或通过XIB实例化sictSlider2.

如果用户点击滑块矩形内部,也会处理Tap.潘也有

[self sendActionsForControlEvents:UIControlEventValueChanged];

因为ValueChanged事件仅在拇指移动时发生,并且当Pan处理程序接管时拇指在一点距离后停止移动.

Happy CutAndPaste!

码:

#import "sictSlider2.h"

@implementation sictSlider2

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {


        UIPanGestureRecognizer * recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
        recognizer.delegate = self;
        [self addGestureRecognizer:recognizer];

        UITapGestureRecognizer * recognizer2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
        recognizer2.delegate = self;
        [self addGestureRecognizer:recognizer2];

        UIPinchGestureRecognizer * recognizer3 = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
        recognizer3.delegate = self;
        [self addGestureRecognizer:recognizer3];

        UISwipeGestureRecognizer * recognizer4 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
        recognizer4.delegate = self;
        [self addGestureRecognizer:recognizer4];

        self.backgroundColor = [UIColor clearColor];   
    }
    return self;
}


- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self) {

        UIPanGestureRecognizer * recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
        recognizer.delegate = self;
        [self addGestureRecognizer:recognizer];

        UITapGestureRecognizer * recognizer2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
        recognizer2.delegate = self;
        [self addGestureRecognizer:recognizer2];

        UIPinchGestureRecognizer * recognizer3 = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
        recognizer3.delegate = self;
        [self addGestureRecognizer:recognizer3];

        UISwipeGestureRecognizer * recognizer4 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
        recognizer4.delegate = self;
        [self addGestureRecognizer:recognizer4];

        self.backgroundColor = [UIColor clearColor];     
    }
    return self;
}


- (void)handleTap:(UITapGestureRecognizer *)recognizer{

    CGPoint p = [recognizer locationInView:recognizer.view];    
    NSLog (@"in slider tap %f %f ", p.x, p.y);

    float val = self.value;  // current slider value
    // t.x is in coords of the slider rect, so divide by width to get delta

    val = p.x/self.frame.size.width;
    [self setValue:val];
    [self setNeedsDisplay];

}
- (void)handlePan:(UIPanGestureRecognizer *)recognizer {

    CGPoint t = [recognizer translationInView:recognizer.view];
    NSLog(@"in slider pan %f %f", t.x, t.y);

    float val = self.value;  // current slider value
    // t.x is in coords of the slider rect, so divide by width to get delta

    val = val + t.x/self.frame.size.width;

    [self sendActionsForControlEvents:UIControlEventValueChanged];
    [self setValue:val];
    [self setNeedsDisplay];
    [recognizer setTranslation:CGPointMake(0, 0) inView:recognizer.view];   
}

- (void)handleSwipe:(UISwipeGestureRecognizer *)recognizer{
      NSLog(@"slider SWIPE");}
@end

和.h

#import <UIKit/UIKit.h>

@interface sictSlider2 : UISlider
- (void)handleTap:(UITapGestureRecognizer *)recognizer;
- (void)handlePan:(UIPanGestureRecognizer *)recognizer;
- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer;
- (void)handleSwipe:(UISwipeGestureRecognizer *)recognizer;
@end