iOS UIView添加快捷手势回调

简介: iOS UIView添加快捷手势回调

前言


· UIView是我们在开发中经常使用到的控件,很多时候需要在该控件上面添加手势处理。常规的做法就是实例手势然后添加,程序员都是很懒的,并且我也一直比较喜欢东西都放在一起查找起来也方便。常规的声明和处理分开在代码量巨大的情形之下找起来还是略显麻烦,所以我将手势封装一下,方便使用


API


NS_ASSUME_NONNULL_BEGIN
typedef void(^KJGestureRecognizerBlock)(UIView *view, UIGestureRecognizer *gesture);
typedef NS_ENUM(NSUInteger, KJGestureType) {
    KJGestureTypeTap,       // 点击
    KJGestureTypeDouble,    // 双击
    KJGestureTypeLongPress, // 长按
    KJGestureTypeSwipe,     // 轻扫
    KJGestureTypePan,       // 移动
    KJGestureTypeRotate,    // 旋转
    KJGestureTypePinch,     // 缩放
};
static NSString * const _Nonnull KJGestureTypeStringMap[] = {
    [KJGestureTypeTap]       = @"UITapGestureRecognizer",
    [KJGestureTypeDouble]    = @"UITapGestureRecognizer",
    [KJGestureTypeLongPress] = @"UILongPressGestureRecognizer",
    [KJGestureTypeSwipe]     = @"UISwipeGestureRecognizer",
    [KJGestureTypePan]       = @"UIPanGestureRecognizer",
    [KJGestureTypeRotate]    = @"UIRotationGestureRecognizer",
    [KJGestureTypePinch]     = @"UIPinchGestureRecognizer",
};
@interface UIView (KJGestureBlock)
/// 单击手势
- (UIGestureRecognizer*)kj_AddTapGestureRecognizerBlock:(KJGestureRecognizerBlock)block;
/// 手势处理
- (UIGestureRecognizer*)kj_AddGestureRecognizer:(KJGestureType)type block:(KJGestureRecognizerBlock)block;
@end
NS_ASSUME_NONNULL_END


使用示例


_weakself;
[self.displayImageView kj_AddTapGestureRecognizerBlock:^(UIView * _Nonnull view, UIGestureRecognizer * _Nonnull gesture) {
    NSLog(@"单击");
}];
[self.displayImageView kj_AddGestureRecognizer:(KJGestureTypeDouble) block:^(UIView * _Nonnull view, UIGestureRecognizer * _Nonnull gesture) {
    NSLog(@"双击");
}];
[self.displayImageView kj_AddGestureRecognizer:(KJGestureTypePan) block:^(UIView * _Nonnull view, UIGestureRecognizer * _Nonnull gesture) {
    UIPanGestureRecognizer *panGestureRecognizer = (UIPanGestureRecognizer*)gesture;
    CGPoint translation = [panGestureRecognizer translationInView:panGestureRecognizer.view];
    NSLog(@"移动%.2f",translation.x);
}];
[self.displayImageView kj_AddGestureRecognizer:(KJGestureTypePinch) block:^(UIView * _Nonnull view, UIGestureRecognizer * _Nonnull gesture) {
    UIPinchGestureRecognizer *pinchGestureRecognizer = (UIPinchGestureRecognizer*)gesture;
    NSLog(@"缩放%.2f,%.2f",weakself.lastScale,pinchGestureRecognizer.scale);
    switch (pinchGestureRecognizer.state) {
        case UIGestureRecognizerStateBegan:
        case UIGestureRecognizerStateChanged:{
            CGFloat scale = weakself.lastScale+pinchGestureRecognizer.scale-1;
            if (scale >= weakself.maxScale || scale <= weakself.minScale) {
                return;
            }
            CGFloat w = kScreenW * scale;
            CGFloat h = kScreenH * scale;
            CGFloat x = weakself.originRect.origin.x - (kScreenW*(scale-1))/2.;
            CGFloat y = weakself.originRect.origin.y - (kScreenH*(scale-1))/2.;
            view.frame = CGRectMake(x, y, w, h);
        }
            break;
        case UIGestureRecognizerStateEnded:{
            CGFloat scale = weakself.lastScale+pinchGestureRecognizer.scale-1;
            if (scale >= weakself.maxScale) {
                weakself.lastScale = weakself.maxScale;
            }else if (scale <= weakself.minScale) {
                weakself.lastScale = weakself.minScale;
            }else{
                weakself.lastScale += (pinchGestureRecognizer.scale-1);
            }
        }
            break;
        default:
            break;
    }
}];


简单介绍


1. 开启视图的交换


外界使用的时候也不需要再写该属性,又省一句代码- -|

self.userInteractionEnabled = YES;


2. 声明和添加


这里提供七种手势枚举

typedef NS_ENUM(NSUInteger, KJGestureType) {
    KJGestureTypeTap,       // 点击
    KJGestureTypeDouble,    // 双击
    KJGestureTypeLongPress, // 长按
    KJGestureTypeSwipe,     // 轻扫
    KJGestureTypePan,       // 移动
    KJGestureTypeRotate,    // 旋转
    KJGestureTypePinch,     // 缩放
};
static NSString * const _Nonnull KJGestureTypeStringMap[] = {
    [KJGestureTypeTap]       = @"UITapGestureRecognizer",
    [KJGestureTypeDouble]    = @"UITapGestureRecognizer",
    [KJGestureTypeLongPress] = @"UILongPressGestureRecognizer",
    [KJGestureTypeSwipe]     = @"UISwipeGestureRecognizer",
    [KJGestureTypePan]       = @"UIPanGestureRecognizer",
    [KJGestureTypeRotate]    = @"UIRotationGestureRecognizer",
    [KJGestureTypePinch]     = @"UIPinchGestureRecognizer",
};

NSClassFromString得到对应的手势类

NSString *string = KJGestureTypeStringMap[type];
__block UIGestureRecognizer *gesture = [[NSClassFromString(string) alloc] initWithTarget:self action:@selector(kGestureAction:)];
[gesture setDelaysTouchesBegan:YES];
[self addGestureRecognizer:gesture];


3. 解决单击和双击共存问题


if (type == KJGestureTypeTap) {
    [self.gestureRecognizers enumerateObjectsUsingBlock:^(__kindof UIGestureRecognizer *recognizer, NSUInteger idx, BOOL *stop) {
        if ([recognizer isKindOfClass:[UITapGestureRecognizer class]] && ((UITapGestureRecognizer*)recognizer).numberOfTapsRequired == 2) {
            [gesture requireGestureRecognizerToFail:recognizer];
            *stop = YES;
        }
    }];
    string = [string stringByAppendingString:@"Tap"];
}else if (type == KJGestureTypeDouble) {
    [(UITapGestureRecognizer*)gesture setNumberOfTapsRequired:2];
    [self.gestureRecognizers enumerateObjectsUsingBlock:^(__kindof UIGestureRecognizer *recognizer, NSUInteger idx, BOOL *stop) {
        if ([recognizer isKindOfClass:[UITapGestureRecognizer class]] && ((UITapGestureRecognizer*)recognizer).numberOfTapsRequired == 1) {
            [recognizer requireGestureRecognizerToFail:gesture];
            *stop = YES;
        }
    }];
    string = [string stringByAppendingString:@"Double"];
}


4. 保存回调


这里增加一个selectorString属性来区分不同的回调

self.selectorString = string;
self.gesrureblock = block;

NSSelectorFromString 得到不同的回调

#pragma mark - associated
- (NSString*)selectorString{
    return objc_getAssociatedObject(self, @selector(selectorString));
}
- (void)setSelectorString:(NSString*)selectorString{
    objc_setAssociatedObject(self, @selector(selectorString), selectorString, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (KJGestureRecognizerBlock)gesrureblock{
    return (KJGestureRecognizerBlock)objc_getAssociatedObject(self, NSSelectorFromString(self.selectorString));
}
- (void)setGesrureblock:(KJGestureRecognizerBlock)gesrureblock{
    objc_setAssociatedObject(self, NSSelectorFromString(self.selectorString), gesrureblock, OBJC_ASSOCIATION_COPY_NONATOMIC);
}


5. 处理手势
- (void)kGestureAction:(UIGestureRecognizer*)gesture{
    NSString *string = NSStringFromClass([gesture class]);
    if ([gesture isKindOfClass:[UITapGestureRecognizer class]]) {
        if (((UITapGestureRecognizer*)gesture).numberOfTapsRequired == 1) {
            string = [string stringByAppendingString:@"Tap"];
        }else {
            string = [string stringByAppendingString:@"Double"];
        }
    }
    self.selectorString = string;
    self.gesrureblock(gesture.view, gesture);
}


备注:本文用到的部分函数方法和Demo,均来自三方库**KJEmitterView**,如有需要的朋友可自行pod 'KJEmitterView'引入即可


视图UIView添加手势回调介绍就到此完毕,后面有相关再补充,写文章不容易,还请点个**小星星**传送门

相关文章
|
iOS开发
iOS短信验证码控件,自动输入回调两次解决办法
iOS短信验证码控件,自动输入回调两次解决办法
374 0
|
存储 自然语言处理 API
iOS 多语言快捷设置Xib设置
iOS 多语言快捷设置Xib设置
iOS 多语言快捷设置Xib设置
|
API iOS开发 Perl
iOS UIButton图文混排快捷显示
iOS UIButton图文混排快捷显示
iOS UIButton图文混排快捷显示
|
API iOS开发
iOS开发-SDWebImage的回调不addSubView不会调用
iOS开发-SDWebImage的回调不addSubView不会调用
65 0
iOS开发-SDWebImage的回调不addSubView不会调用
|
Go iOS开发
iOS使用xib自定义uiview
iOS使用xib自定义uiview
336 0
iOS使用xib自定义uiview
|
存储 API iOS开发
iOS UIView动画效果
iOS UIView动画效果
|
API iOS开发 Perl
ios UIButton点击快捷回调
ios UIButton点击快捷回调
|
iOS开发
IOS给任意UIView截屏
IOS给任意UIView截屏
152 0
|
iOS开发
iOS开发之指定UIView的某几个角(小于4)为圆角
在iOS开发中,我们经常会遇到View设置圆角的问题,如果需要将UIView的4个角全部都为圆角,做法相当简单,只需设置其Layer的cornerRadius属性即可(项目需要使用QuartzCore框架)。而若要指定某几个角(小于4)为圆角而别的不变时,这种方法就不好用了。
iOS开发之指定UIView的某几个角(小于4)为圆角
|
iOS开发
iOS动画开发之三——UIView的转场切换
iOS动画开发之三——UIView的转场切换
348 0