今天這更有點遲了，讓大家久等了。哈哈，今天好玩的又來了，我們來玩一玩，怎麼把一張照片，旋轉放大加移動。很期待吧，那麼事不宜遲我們來實現它們。
說到這些功能，在ios中實現無非就是手勢觸摸功能，加上計算偏移，算出座標。就ok了。非常的簡單。
我們新建一個工程
#import "ViewController.h"
@interface ViewController ()<UIGestureRecognizerDelegate>
{
UIImageView *_imageView;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self createImageView];
[self createPinchGesture];
[self createRotataeGesture];
// [self createPanGesture];
}
//創建縮放手勢
-(void)createPinchGesture
{
UIPinchGestureRecognizer *pinchGes =[[UIPinchGestureRecognizer alloc]init];
pinchGes .delegate = self;
[pinchGes addTarget:self action:@selector(pinchGes:)];
[_imageView addGestureRecognizer:pinchGes];
}
-(void)pinchGes:(UIPinchGestureRecognizer *)ges
{
//比列
CGFloat scale = ges.scale;
//改變視圖比列
ges.view.transform = CGAffineTransformScale(ges.view.transform, scale, scale);
//比列爲1
ges.scale = 1;
}
//創建旋轉手勢
-(void)createRotataeGesture
{
UIRotationGestureRecognizer *rotationGes = [[UIRotationGestureRecognizer alloc]init];
rotationGes.delegate = self;
[rotationGes addTarget:self action:@selector(rotGes:)];
[_imageView addGestureRecognizer:rotationGes];
}
-(void)rotGes:(UIRotationGestureRecognizer *)ges
{
ges.view.transform = CGAffineTransformRotate(ges.view.transform, ges.rotation);
ges.rotation = 0;
}
-(void)createImageView
{
UIImageView *imageView = [[UIImageView alloc]init];
imageView.frame = CGRectMake(30, 60, 330, 500);
imageView.image = [UIImage imageNamed:@"webwxgetmsgimg.jpg"];
imageView.userInteractionEnabled = YES;
[self.view addSubview:imageView];
_imageView = imageView;
}
//計算偏移量移動圖片
//第一種計算方式
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[[self class] cancelPreviousPerformRequestsWithTarget:self];
//取到當前觸摸對象
UITouch *touch = [touches anyObject];
//當前位置
CGPoint point = [touch locationInView:self.view];
//之前的位置
CGPoint prePoint = [touch previousLocationInView:self.view];
//計算兩次點擊的偏移量
CGPoint trans = CGPointMake(point.x - prePoint.x, point.y - prePoint.y);
//修改imageview的結構（imageview的中心點 賦給center ，就是座標的變化）
CGPoint center = _imageView.center;
//把計算出來的偏移量，就是imagview的x軸加上算出來的偏移量，如是y軸不變，那就是0，不用加
_imageView.center = CGPointMake(center.x + trans.x, center.y+ trans.y);
//這個是點擊事件，因爲都已經經過準確的計算，每次都有精確的偏移量所以不需要清理上次的偏移量
}
//第2種計算方式
//-(void)createPanGesture
//{
// UIPanGestureRecognizer *panGse = [[UIPanGestureRecognizer alloc]init];
//
// panGse.delegate = self;
//
// [panGse addTarget:self action:@selector(panGes1:)];
// [_imageView addGestureRecognizer:panGse];
//}
//-(void)panGes1:(UIPanGestureRecognizer *)ges
//{
// CGPoint point = [ges translationInView:ges.view];
//
// ges.view.transform = CGAffineTransformTranslate(ges.view.transform, point.x, point.y);
//
// //偏移量清零(這個事手勢，如果每次手勢調用都不清理會自動累加到下次，造成不精確，所以每次都要清理上次的偏移量，重新計算下次的，保證精確)這個沒有經過準確的計算
////就是回到原先位置，然後從新計算，不然會累積到下次來
// [ges setTranslation:CGPointZero inView:ges.view];
//
//
//}
//和其他手勢一起進行
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
@end
沒錯，這就是本公子了，哈哈。今天到此結束，大年30休息，（提前說下）就不更了，祝大家過個好年。
