51自学网官方网站,国外平台卖货,网站如何留言,2022年小微企业所得税优惠政策「OC」UI练习——照片墙 文章目录 「OC」UI练习——照片墙UITapGestureRecognizer介绍照片墙实现 UITapGestureRecognizer介绍
UITapGestureRecognizer是UIKit框架中的一个手势识别器类#xff0c;用于检测用户在视图上的轻击手势。它是UIGestureRecognizer的一个子类#x…「OC」UI练习——照片墙 文章目录 「OC」UI练习——照片墙UITapGestureRecognizer介绍照片墙实现 UITapGestureRecognizer介绍
UITapGestureRecognizer是UIKit框架中的一个手势识别器类用于检测用户在视图上的轻击手势。它是UIGestureRecognizer的一个子类可以通过将它添加到视图上来监听并响应用户的轻击手势。
使用UITapGestureRecognizer你可以指定轻击手势的触发条件例如点击次数和触摸点数量。当用户触发了指定条件的轻击手势时你可以在相应的处理方法中执行自定义的操作。
以下为UITapGestureRecognizer的实际用法
#import UIKit/UIKit.h
#import ViewController.h
#import JCViewViewController.h
#import JCSuperView.hinterface ViewController ()endimplementation ViewController//在第一次加载被使用
- (void)viewDidLoad {[super viewDidLoad];[self useGesture];
}-(void)useGesture {UIImage *image [UIImage imageNamed:1.jpg];UIImageView *iview [[UIImageView alloc] initWithFrame:CGRectMake(20, 20, 300, 400)];iview.image image;//是否接受交互若不开启则无法使用手势iview.userInteractionEnabled YES;[self.view addSubview:iview];UITapGestureRecognizer *tap [[UITapGestureRecognizer alloc] initWithTarget:self action:selector(tapToAct:)];//表示手势识别事件类型点几次进行触发 —— 默认值1tap.numberOfTapsRequired 1;//表示几个手指同时点击进行触发 —— 默认值1tap.numberOfTouchesRequired 1;[iview addGestureRecognizer:tap];//实现双击缩小UITapGestureRecognizer *tap2 [[UITapGestureRecognizer alloc]initWithTarget:self action:selector(tapToact2:)];tap2.numberOfTapsRequired 2;tap2.numberOfTouchesRequired 1;[iview addGestureRecognizer:tap2];//单击操作与双击操作冲突时单击操作失效[tap requireGestureRecognizerToFail:tap2];
}//双击缩小
-(void)tapToact2:(UITapGestureRecognizer*)tap {UIImageView *iview (UIImageView*)tap.view;//在这中间做的改变都会通过动画的形式进行演示[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:1];iview.frame CGRectMake(20, 20, 300, 400);[UIView commitAnimations];
}//单击放大
-(void)tapToAct : (UITapGestureRecognizer*) tap {//获取手势的监控对象NSLog(点击);UIImageView *iview (UIImageView*)tap.view;//在这中间做的改变都会通过动画的形式进行演示[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:1];iview.frame [UIScreen mainScreen].bounds;[UIView commitAnimations];
}照片墙实现
#import SceneDelegate.h
#import JCRoot.h
interface SceneDelegate ()endimplementation SceneDelegate- (void)scene:(UIScene *)scene willConnectToSession:(UISceneSession *)session options:(UISceneConnectionOptions *)connectionOptions {//导航控制器框架self.window.frame [UIScreen mainScreen].bounds;//设置导航器UINavigationController *nav [[UINavigationController alloc] initWithRootViewController:[[JCRoot alloc] init]];self.window.backgroundColor [UIColor whiteColor];self.window.rootViewController nav;[self.window makeKeyAndVisible];
}
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//根视图的.m文件
#import JCRoot.h
#import JCShowPicture.h
interface JCRoot ()endimplementation JCRoot- (void)viewDidLoad {[super viewDidLoad];self.title 照片墙;UIScrollView *sv [[UIScrollView alloc] initWithFrame:CGRectMake(5, 10, 380, 852)];sv.backgroundColor [UIColor orangeColor];//导航栏不透明self.navigationController.navigationBar.translucent YES;//画布大小sv.contentSize CGSizeMake(380, 852 * 1.5);sv.userInteractionEnabled YES;//修改背景颜色self.navigationController.navigationBar.barTintColor [UIColor whiteColor];for (int i 0; i 5; i) {NSString *name [NSString stringWithFormat:%d.png, i 1];UIImage *image [UIImage imageNamed:name];UIImageView *iv [[UIImageView alloc] initWithImage:image];iv.frame CGRectMake(0, i * 170, 380, 160);iv.userInteractionEnabled YES;[sv addSubview:iv];UITapGestureRecognizer *tap [[UITapGestureRecognizer alloc] initWithTarget:self action:selector(pressTap:)];//单次点击tap.numberOfTapsRequired 1;//单个手指tap.numberOfTouchesRequired 1;//[iv addGestureRecognizer:tap];}[self.view addSubview: sv];
}-(void) pressTap :(UITapGestureRecognizer *)tap {NSLog(点击触发);UIImageView *iview [[UIImageView alloc]init];iview (UIImageView*)tap.view;//创建视图控制器JCShowPicture *show [[JCShowPicture alloc] init];show.image iview.image;[self.navigationController pushViewController:show animated:YES];
}
/*
#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {// Get the new view controller using [segue destinationViewController].// Pass the selected object to the new view controller.
}
*/end
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//展示栏的相关内容
#import JCShowPicture.hinterface JCShowPicture ()endimplementation JCShowPicture- (void)viewDidLoad {[super viewDidLoad];self.title 照片;_imageView [[UIImageView alloc] initWithFrame:CGRectMake(5, 10, 380, 852)];_imageView.image _image;//视图对象只有一个根视图//当我们将视图对象添加至新的父视图上//会将该视图对象会从原来的父视图删除[self.view addSubview: _imageView];
}
得到的界面如下所示
