Ios 如何从目标c中的定位点使用滑动手势旋转图像?
在这里,我旋转一个给定角度的图像。但是我想从一个定位点旋转一个带有滑动手势的图像Ios 如何从目标c中的定位点使用滑动手势旋转图像?,ios,objective-c,xcode,Ios,Objective C,Xcode,在这里,我旋转一个给定角度的图像。但是我想从一个定位点旋转一个带有滑动手势的图像 - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //circleName is an UIImageView IBoutlet _circleName
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//circleName is an UIImageView IBoutlet
_circleNames=@"Squre.png";
_showCircle=[UIImage imageNamed:_circleNames];
_circleView.image=_showCircle;
// Here I am setting anchor point
_circleView.layer.anchorPoint=CGPointMake(0.5, 1.0);
//here I am setting animation
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:6];
[UIView setAnimationRepeatCount:0];
[UIView setAnimationDelegate:self];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
//rotate 170 degree angle
_circleView.transform=CGAffineTransformRotate(_circleView.transform,170);
[UIView commitAnimations];
}
可以使用此选项将图像旋转90度
CGAffineTransformMakeRotation(CGFloat(M_PI_2))
如果要随手指动态旋转图像,必须使用
uipangestureerecognizer
(而不是uisweegestureerecognizer
)。它会在您提供的反复调用的选择器中指出您的手指
更新:
您可以使用以下代码:
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView* rotView;
@end
@implementation ViewController {
UIPanGestureRecognizer* _panGesture;
float _deltaAngle;
CGAffineTransform _startTransform;
CGPoint _prevPoint;
}
- (void) viewDidLoad {
[super viewDidLoad];
_panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(rotateItem:)];
_panGesture.delegate = self;
[self.rotView addGestureRecognizer:_panGesture];
}
- (void) rotateItem:(UIPanGestureRecognizer *)recognizer {
CGPoint currPoint = [recognizer locationInView:self.view];
CGPoint center = recognizer.view.center;
CGFloat ang = atan2f(currPoint.y - center.y, currPoint.x - center.x) - atan2f(_prevPoint.y - center.y, _prevPoint.x - center.x);
_prevPoint = [recognizer locationInView:self.view];
_deltaAngle += ang;
self.rotView.transform = CGAffineTransformRotate(_startTransform, _deltaAngle);
}
- (BOOL) gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)recognizer {
_startTransform = self.rotView.transform;
return YES;
}
@end
更新2
我在github上创建了带有示例的类(和类别):
170度?170英寸弧度更有可能。可能是:)我是iOS新手。谢谢。谢谢。但当我触摸手指时,我想从一个定位点移动/旋转图像。如果您提供代码来帮助我,我将不胜感激。我已成功地从您的更新代码中旋转了一个项目/图像视图。但我的任务是在旋转项目时显示四个图像或逐个移动这些图像。@Md.AshikMahmud只需在一个视图中放置一个图像,并在Interface builder中将此视图的自定义类设置为UIRatatableView(并确保rotatable属性设置为YES)。如果您在github上使用我的库,则无其他代码(请参阅update2)。谢谢。但我的任务正在以某种方式更改。这是我的新问题,请在这里发表评论,我也尝试了您的类,但IB_DESIGNABLE中存在错误。我的Xcode不知道这一点。