UI中各种手势的使用点击,捏合,清扫,旋转,平移,边缘移动,长按
#import "RootViewController.h"
@interface RootViewController ()
{
UIImageView *imageView;
NSInteger number;//用于存放图片的名字
BOOL flag;//用于标记当前是哪张图片
}
@end
@implementation RootViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor yellowColor];
//默认值是yes;用于点击事件更改照片
flag = YES;
imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"美女1.png"]];
imageView.frame = [UIScreen mainScreen].bounds;
//contentMode内容模式
//UIViewContentModeScaleToFill规模填充
//UIViewContentModeScaleAspectFit内容符合固定方面。剩余部分是透明的
//UIViewContentModeScaleAspectFill内容扩展与固定方面填补。可能是剪的一部分内容。
//UIViewContentModeRedraw重划边界变化(调用-setNeedsDisplay)
//UIViewContentModeCenter内容保持相同大小。定位调整。
imageView.contentMode = UIViewContentModeScaleToFill;
//UIIamgeView 和 UILabel一样,默认的交互是关闭的NO
//所以用userInteractionEnabled = YES
imageView.userInteractionEnabled = YES;
[self.view addSubview:imageView];
[imageView release];
//UISegmentedControl,分段控制器,继承于UIControl
//参数:参数类型,数组内存放每个分段控制按钮的标题
NSArray *items = @[@"点击", @"捏合", @"旋转", @"清扫", @"平移", @"边缘移动", @"长按"];
UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:items];
segmentedControl.frame = CGRectMake(0, 20, self.view.frame.size.width, 40);
//关联方法
//分段控制器,触发事件是UIControlEventValueChanged//和button的不一样UIControEventTouchUpInside
[segmentedControl addTarget:self action:@selector(changeGesture:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:segmentedControl];
[segmentedControl release];
// Do any additional setup after loading the view.
}
- (void)changeGesture:(UISegmentedControl *)aControl
{
//选中的是第几个区域
//selectedSegmentIndex, 从0开始依次增加
NSLog(@"%ld", aControl.selectedSegmentIndex);
//抽象基类的特点:不能够直接使用,必须通过子类化的形式才能使用,换言之,只能使用子类
//UIGestureRecognizer,手势识别器,其实是对触摸的封装,是抽象基类
//移除之前的手势
for (UIGestureRecognizer *gesture in imageView.gestureRecognizers) {
[imageView removeGestureRecognizer:gesture];
}
switch (aControl.selectedSegmentIndex) {
case 0://单击
{
//单击手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gesture)];
//单击次数
tap.numberOfTapsRequired = 2;
//需要几个手指同时点击
tap.numberOfTouchesRequired = 1;
//把手势添加到某个视图上
[imageView addGestureRecognizer:tap];
//释放
[tap release];
}
break;
case 1://捏合
{
//捏合手势
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
[imageView addGestureRecognizer:pinch];
[pinch release];
}
break;
case 2://旋转
{ //旋转手势
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
[imageView addGestureRecognizer:rotation];
[rotation release];
}
break;
case 3://清扫
{//清扫手势
// imageView.image = [UIImage imageNamed:@"美女1.png"];
// imageView.contentMode = UIViewContentModeScaleToFill;
//向左滑动
UISwipeGestureRecognizer *leftWipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swape:)];
//设置初始值1
number = 1;
//设置方向, 左右(只支持一个方向)
leftWipe.direction = UISwipeGestureRecognizerDirectionLeft;
[imageView addGestureRecognizer:leftWipe];
[leftWipe release];
//向右滑动
UISwipeGestureRecognizer *rightSwipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swape:)];
//设置初始值1
number = 1;
//设置方向, 左右(只支持一个方向)
rightSwipe.direction = UISwipeGestureRecognizerDirectionRight;
[imageView addGestureRecognizer:rightSwipe];
[rightSwipe release];
}
break;
case 4://平移
{
//平移手势
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
[imageView addGestureRecognizer:pan];
[pan release];
}
break;
case 5://边缘移动//扁平化之后才有的
{
//注意:边缘移动手势触摸的机制,必须保证视图紧贴屏幕的边缘
UIScreenEdgePanGestureRecognizer *edgePan = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(edgePan)];
//边缘(支持一个方向)
edgePan.edges = UIRectEdgeLeft;
edgePan.edges = UIRectEdgeRight;
[imageView addGestureRecognizer:edgePan];
[edgePan release];
}
break;
case 6://长按
{
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
//时间相应(按多长时间)
longPress.minimumPressDuration = 1.0;
[imageView addGestureRecognizer:longPress];
[longPress release];
}
break;
default:
break;
}
}
#pragma mark ---单击响应方法的实现
/**
* 单击响应方法的实现
通过点击实现两个图片的交换显示
*/
- (void)gesture
{
//1.第一种方法
// if (flag) {
// imageView.image = [UIImage imageNamed:@"美女1.png"];
// imageView.contentMode = UIViewContentModeScaleToFill;
// flag = NO;
// } else {
//
// imageView.image = [UIImage imageNamed:@"美女2.png"];
// imageView.contentMode = UIViewContentModeScaleToFill;//图片填充
// flag = YES;
//
// }
//2.第二种方法,三目运算
imageView.image = flag ? [UIImage imageNamed:@"美女2.png"] : [UIImage imageNamed:@"美女1.png"];
flag = !flag;
}
#pragma mark ---捏合方法的实现
- (void)pinch:(UIPinchGestureRecognizer *)aPinch
{
//aPinch.scale缩放比率
NSLog(@"%.2f", aPinch.scale);
//图像的变形 transform 是UIView的属性
//图像的变形
//CGAffineTransformScale(缩放比例, X轴, Y轴)
//参数1:原始图的transform
//参数2:X轴上改变的比率
//参数3:Y轴上改变的比率
imageView.transform = CGAffineTransformScale(imageView.transform, aPinch.scale, aPinch.scale);
//重置比率(是为了让图像的比率正常)
aPinch.scale = 1;
}
#pragma mark ---旋转方法的实现
- (void)rotation:(UIRotationGestureRecognizer *)aRotation
{
//旋转角度
NSLog(@"%.2f", aRotation.rotation);
//改变图片旋转角度
//参数1:视图原先的transform
//参数2:变化的角度
imageView.transform = CGAffineTransformRotate(imageView.transform, aRotation.rotation);
//重置角度
aRotation.rotation = 0;
}
#pragma mark ---清扫方法的实现
- (void)swape:(UISwipeGestureRecognizer *)aSwape
{
if (aSwape.direction == UISwipeGestureRecognizerDirectionLeft) {
number++;
if (number == 9) {//当向左滑动9次时,第9次变为从1张图片开始
number = 1;
}
}
if (aSwape.direction == UISwipeGestureRecognizerDirectionRight) {
number--;
if (number == 0) {//本身是1当向右滑动1次时变为0,变为从8张图片开始
number = 8;
}
}
NSString *name = [NSString stringWithFormat:@"美女%ld.png", number];
imageView.image = [UIImage imageNamed:name];
}
#pragma mark ---平移方法的实现
- (void)pan:(UIPanGestureRecognizer *)aPan
{
//手指移动的位置(X轴和Y轴偏移量)
CGPoint point = [aPan translationInView:imageView];
NSLog(@"%@", NSStringFromCGPoint(point));
// //更改center偏移量
// //方法1.
// CGPoint temp = imageView.center;
// temp.x += point.x;
// temp.y += point.y;
// imageView.center = temp;
// //重置point
// [aPan setTranslation:CGPointZero inView:imageView];
//
//方法2
//参数1:图片原有的transform
//参数2:X轴位移
//参数3:Y轴位移
imageView.transform = CGAffineTransformTranslate(imageView.transform, point.x, point.y);
[aPan setTranslation:CGPointZero inView:imageView];
}
#pragma mark ---边缘移动方法的实现
- (void)edgePan
{
NSLog(@"边缘");
}
#pragma mark ---长按方法的实现
- (void)longPress:(UILongPressGestureRecognizer *)aLongPress
{
//手势状态
//aLongPress.state
if (aLongPress.state == UIGestureRecognizerStateBegan) {
//屏幕截图
//绘制一张图片,屏幕大小
UIGraphicsBeginImageContext([UIScreen mainScreen].bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
//绘画结束
UIGraphicsEndImageContext();
//存到相册中
UIImageWriteToSavedPhotosAlbum(viewImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
// 结束触发
// if (aLongpress.state == UIGestureRecognizerStateEnded) {
// <#statements#>
// }
}
#pragma mark ---屏幕截图提示方法的实现
- (void) image: (UIImage *) image
didFinishSavingWithError: (NSError *) error
contextInfo: (void *) contextInfo {
UIAlertView *alterView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"图片已保存" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles: nil];
[alterView show];
[alterView release];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#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
