---恢复内容开始---
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//实例化图片视图对象
UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 100, 320, 320)];
//设置图片背景颜色
imageView.backgroundColor=[UIColor redColor];
//将图片视图对象添加到根视图对象上
[self.view addSubview:imageView];
//设置图片视图对象的一组动态图片
imageView.animationImages=[self animationImages];
imageView.animationDuration=2;//遍历一遍需要的时间
imageView.animationRepeatCount=-1;//重复次数,-1表示无数次
[imageView startAnimating];
//实例化开始按钮对象,大小(100,30)位置从根视图坐标系统的原点偏移(110,440),按钮初始文字"开始"
//按钮触发事件,didClickButton;self,按钮变量名,button
UIButton *button=[[UIButton alloc]initWithFrame:CGRectMake(110, 440, 100, 30)];
[button setTitle:@"开始" forState:UIControlStateNormal];
button.backgroundColor=[UIColor orangeColor];
[button addTarget:self action:@selector(didClickButton:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
-(void)didClickButton:(UIButton *)button
{
if ([button.titleLabel.text isEqualToString:@"开始"]) {
[button setTitle:@"结束" forState:UIControlStateNormal];
return;
}
[button setTitle:@"开始" forState:UIControlStateNormal];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//加载动态图片
-(NSArray *)animationImages
{
//用来存储图片的名字,路径
NSMutableArray *array=[NSMutableArray new];
//程序安装包的根路径
NSString *rootPath=[[NSBundle mainBundle]resourcePath];
//图片文件的路径
NSString *imageDirectiory=[rootPath stringByAppendingString:@"/ImagePackage"];
//遍历生成40张图片路径
for (NSInteger index=1; index<=40; index++) {
NSString *imagePath=[imageDirectiory stringByAppendingFormat:@"/2250_3650903_179fb89ae279fae-%d(被拖移).tiff",index];
//用文件内容初始化成一张图片
UIImage *image=[[UIImage alloc]initWithContentsOfFile:imagePath];
//每一张图片路径添加到数组内
[array addObject:image];
}
return array;
}
@end
UIEvent,事件分三类:触摸事件/晃动事件/远程控制事件
UIResponder是基类,所有UIView派生出来的UIKit类都源自他,他继承与NSObject
第一响应者是应用程序中当前负责接受触摸事件的响应者对象.
响应者链:硬件--响应者--application--window--viewController--View.
1,在一定时间内关闭事件传递:应用程序调用UIApplication的beginIgnoringInteractionEvents和endIgnoringInteractionEvents
2,UIGestureRecognizer tap longTap swipe rotation pan平移 pinch捏合
//实例化图像视图
UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(10, 100, 300, 300)];
UIImage *image=[UIImage imageNamed:@"test"];
imageView.image=image;
imageView.userInteractionEnabled=YES;
// UITapGestureRecognizer:UIGestureRecognizer 点击
// UISwipeGestureRecognizer:UIGestureRecognizer 轻扫
// UILongPressGestureRecognizer:UIGestureRecognizer 长按
// UIPanGestureRecognizer:UIGestureRecognizer 拖拽
// UIPinchGestureRecognizer:UIGestureRecognizer 捏合
// UIRotationGestureRecognizer:UIGestureRecognizer 翻转
UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]init];
//点击需要的手指头个数
[tapGesture setNumberOfTouchesRequired:1];
//点击需要的次数
[tapGesture setNumberOfTapsRequired:1];
//添加手势成功识别后的动作及发送对象
[tapGesture addTarget:self action:@selector(_tapMethods:)];
[self.view addSubview:imageView];
// [imageView addGestureRecognizer:tapGesture];
UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer alloc]init];
[longPress setNumberOfTapsRequired:1];
[longPress setNumberOfTouchesRequired:1];
//最小识别时长
[longPress setMinimumPressDuration:0.1];
//设置允许的误差
[longPress setAllowableMovement:12];
//添加目标动作
[longPress addTarget:self action:@selector(longMethod:)];
[imageView addGestureRecognizer:longPress];
}
-(void)longMethod:(UILongPressGestureRecognizer *)sender
{
NSLog(@"%s",__FUNCTION__);
}
-(void)_tapMethods:(UITapGestureRecognizer *)tap
{
UIActionSheet *actionSheet=[[UIActionSheet alloc]initWithTitle:@"温馨提示" delegate:Nil cancelButtonTitle:@"cancel" destructiveButtonTitle:@"点击" otherButtonTitles:@"Ok", nil];
[actionSheet showInView:self.view];
}
最后重点
如下代码有什么问题?
UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(labelOnClick:)];
tap.numberOfTapsRequired=1;
tap.numberOfTouchesRequired=1;
self.label.userInteractionEnabled=YES;
[self.label addGestureRecognizer:tap];
[self.button addGestureRecognizer:tap];
-(void)labelOnClick:sender
{
NSLog(@"label on click");
}
发现label的手势不起作用,原因有两点:
1,label默认UserInteractionEnabled为no,需要设置
[self.label setUserInteractionEnabled:YES];
2,手势对应一个事件,并且对应一个控件,如果label和button用同一个手势,只有后来使用的才会有效果.