-(void)rotate:(id)sender {

    if([(UIRotationGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {

        lastRotation = 0.0;
        return;
    }

    CGFloat rotation = 0.0 - (lastRotation - [(UIRotationGestureRecognizer*)sender rotation]);

    CGAffineTransform oldTransform = [(UIPinchGestureRecognizer*)sender view].transform;
    CGAffineTransform newTransform = CGAffineTransformRotate(oldTransform,rotation);

    [[(UIRotationGestureRecognizer*)sender view] setTransform:newTransform];

    lastRotation = [(UIRotationGestureRecognizer*)sender rotation];
}

以上代码我用于轮换.

imageView.transform = CGAffineTransformIdentity;

此外,如果您没有在其他任何地方使用lastRotation,您可以稍微缩短rotate：方法.

-(void)rotate:(UIRotationGestureRecognizer *)gesture {
    UIView * view = gesture.view;
    view.transform = CGAffineTransformRotate(view.transform,gesture.rotation);
    gesture.rotation = 0;
}

图像越来越紧张..

我该如何解决..

请帮帮我一个人..

提前致谢…..

第一个图像是图像选择器屏幕,第二个图像是我在UIImageView中显示从拾取器捕获的UIImage的位置.

！[这是我的UIImagePickerController] [2]

！[这是捕获后的图像显示在UIImageview中. ] [3]

注意：屏幕两者都处于风景模式

imageView.contentMode = UIViewContentModeScaleAspectFill;

您将无法获得任何空间并且保留了比例.但是,图像的某些部分将被剪掉.

如果您使用：

imageView.contentMode = UIViewContentModeScaleAspectFit;

将有一些空的空间,但保留了比例.

通过来回切换段来第二次调用执行视图旋转动画的方法时会发生此问题.点击重置只会删除最新的动画.我必须第二次切换片段以完全重置动画停止.

当我选择旋转UIImageView的段时调用以下代码,当我在段之间单击时显然第二次调用.

// Begin the animation block and set its name
[UIView beginAnimations:@"Rotate Animation" context:nil];

// Set the duration of the animation in seconds (floating point value)
[UIView setAnimationDuration:0.5];

// Set the number of times the animation will repeat (NSIntegerMax setting would repeat indefinately) (floating point value)
[UIView setAnimationRepeatCount:NSIntegerMax];

// Set the animation to auto-reverse (complete the animation in one direction and then do it backwards)
[UIView setAnimationRepeatAutoreverses:YES];

// Animation curve dictates the speed over time of an animation (UIViewAnimationCurveEaseIn,UIViewAnimationCurveEaSEOut,UIViewAnimationCurveEaseInOut,UIViewAnimationCurveLinear)
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

// Changes the imageViews transform property to rotate the view using CGAffineTransformRotate
// CGAffineTransformRotate(transformToStartFrom,angletoRotateInradians)
// Starting transform property can be set to CGAffineTransformIdentity to start from views original transform state
// This can also be done using CGAffineTransformMakeRotation(angleInradians) to start from the IdentityTransform without implicitly stating so
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform,degreesToradians(90));

[UIView commitAnimations];

重置按钮调用此代码 –

self.imageView.transform = CGAffineTransformIdentity;

[UIView animateWithDuration:0.2 animations:^() {

    self.imageView.transform = CGAffineTransformIdentity;



}];

这是TableViewController的代码：

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic,strong) UIImage *animatedImage;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.animatedImage = [UIImage animatedImageNamed:@"syncing" duration:1.0];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 1;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static BOOL second = NO;

    static Nsstring *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    if (second) {

        cell.imageView.image = nil;
        NSLog(@"Removed image");
    }
    else {

        cell.imageView.image = self.animatedImage;
        NSLog(@"Added image");

        if (![cell.imageView isAnimating]) {

            [cell.imageView startAnimating];
            NSLog(@"Started animation for UIImageView: %@",cell.imageView);
        }
    }

    second = !second;

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

@end

当我点击两次单元格时,这是输出：

Added image
Started animation for UIImageView: <UIImageView: 0x7197540; frame = (0 0; 0 0); opaque = NO; userInteractionEnabled = NO; animations = { UIImageAnimation=<CAKeyframeAnimation: 0x715bc80>; }; layer = <CALayer: 0x71975a0>> - (null)
Removed image
Added image
Started animation for UIImageView: <UIImageView: 0x7197540; frame = (6 6; 30 30); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x71975a0>> - (null)

我在其中一个项目中做了什么,我为UITableViewDelegate实现了 – scrollViewDidScroll：方法(符合uiscrollviewdelegate),并且我调用了一个方法,它只在可见单元格上为图像设置动画(tableView.visibleCells).

另一方面,我不明白你为什么使用静态BOOL second = NO;你可以简单地检查cell.imageView.image ==是否为零.

还要检查你的动画代码,可能是某些东西在那里没有正常工作(请记住,重复使用单元格).