Iphone 我想在ScrollView中放大和缩小。如何'；有可能吗？

我有一个在一个图像滚动视图。我只想放大和缩小滚动视图。如何仅通过收缩就应用放大和缩小？

您必须将

UIScrollView

的

maximumZoomScale

和/或

minimumZoomScale

属性设置为1.0以外的值，以定义您希望用户能够放大/缩小的程度；）

您必须将

UIScrollView

的

maximumZoomScale

和/或

minimumZoomScale

属性设置为1.0以外的值，以定义您希望用户能够放大/缩小的程度；）

只需将文件添加到项目中，并通过这些函数调用它即可

这里的

im2

是UIVIEW，我将图像粘贴在上面，然后通过

viewDidLoad

像这样传递它

- (void)viewDidLoad {
    [self loadFlowersInView:im2];
    [self.view addSubview:im2];
}

- (void) loadFlowersInView: (UIView *) backdrop
{
    NSString *create_button = nil;
    // Add the flowers to random points on the screen
    for (int i = 0; i < 1; i++)
    {
            MagPicAppDelegate *appdelegate = (MagPicAppDelegate *)[[UIApplication sharedApplication] delegate];

            NSString *whichFlower = appdelegate.imageName;
            UIImage *stemp = [UIImage imageNamed:@"approve.png"];
            DragView *dragger = [[DragView alloc] initWithImage:stemp];
            dragger.userInteractionEnabled = YES;
            dragger.center = CGPointMake(160.0f, 140.0f);
            [im2 addSubview:dragger];
            [dragger release];
        }
    }
    [self.view  addSubview:im2];
    [im2 release];
}

现在像这样附加这个函数

- (void)viewDidLoad {
    [self loadFlowersInView:im2];
    [self.view addSubview:im2];
}

- (void) loadFlowersInView: (UIView *) backdrop
{
    NSString *create_button = nil;
    // Add the flowers to random points on the screen
    for (int i = 0; i < 1; i++)
    {
            MagPicAppDelegate *appdelegate = (MagPicAppDelegate *)[[UIApplication sharedApplication] delegate];

            NSString *whichFlower = appdelegate.imageName;
            UIImage *stemp = [UIImage imageNamed:@"approve.png"];
            DragView *dragger = [[DragView alloc] initWithImage:stemp];
            dragger.userInteractionEnabled = YES;
            dragger.center = CGPointMake(160.0f, 140.0f);
            [im2 addSubview:dragger];
            [dragger release];
        }
    }
    [self.view  addSubview:im2];
    [im2 release];
}

-（无效）加载花卉视图：（UIView*）背景
{
NSString*创建按钮=nil；
//将花添加到屏幕上的随机点
对于（int i=0；i<1；i++）
{
MagPicAppDelegate*appdelegate=（MagPicAppDelegate*）[[UIApplication sharedApplication]委托]；
NSString*whichFlower=appdelegate.imageName；
UIImage*stemp=[UIImage ImageName:@“approve.png”]；
DragView*dragger=[[DragView alloc]initWithImage:stemp]；
dragger.userInteractionEnabled=是；
dragger.center=CGPointMake（160.0f，140.0f）；
[im2添加子视图：拖动器]；
[牵引释放]；
}
}
[self.view addSubview:im2]；
[im2释放]；
}

只需将文件添加到项目中并通过这些函数调用即可

这里的

im2

是UIVIEW，我将图像粘贴在上面，然后通过

viewDidLoad

像这样传递它

- (void)viewDidLoad {
    [self loadFlowersInView:im2];
    [self.view addSubview:im2];
}

- (void) loadFlowersInView: (UIView *) backdrop
{
    NSString *create_button = nil;
    // Add the flowers to random points on the screen
    for (int i = 0; i < 1; i++)
    {
            MagPicAppDelegate *appdelegate = (MagPicAppDelegate *)[[UIApplication sharedApplication] delegate];

            NSString *whichFlower = appdelegate.imageName;
            UIImage *stemp = [UIImage imageNamed:@"approve.png"];
            DragView *dragger = [[DragView alloc] initWithImage:stemp];
            dragger.userInteractionEnabled = YES;
            dragger.center = CGPointMake(160.0f, 140.0f);
            [im2 addSubview:dragger];
            [dragger release];
        }
    }
    [self.view  addSubview:im2];
    [im2 release];
}

现在像这样附加这个函数

- (void)viewDidLoad {
    [self loadFlowersInView:im2];
    [self.view addSubview:im2];
}

- (void) loadFlowersInView: (UIView *) backdrop
{
    NSString *create_button = nil;
    // Add the flowers to random points on the screen
    for (int i = 0; i < 1; i++)
    {
            MagPicAppDelegate *appdelegate = (MagPicAppDelegate *)[[UIApplication sharedApplication] delegate];

            NSString *whichFlower = appdelegate.imageName;
            UIImage *stemp = [UIImage imageNamed:@"approve.png"];
            DragView *dragger = [[DragView alloc] initWithImage:stemp];
            dragger.userInteractionEnabled = YES;
            dragger.center = CGPointMake(160.0f, 140.0f);
            [im2 addSubview:dragger];
            [dragger release];
        }
    }
    [self.view  addSubview:im2];
    [im2 release];
}

-（无效）加载花卉视图：（UIView*）背景
{
NSString*创建按钮=nil；
//将花添加到屏幕上的随机点
对于（int i=0；i<1；i++）
{
MagPicAppDelegate*appdelegate=（MagPicAppDelegate*）[[UIApplication sharedApplication]委托]；
NSString*whichFlower=appdelegate.imageName；
UIImage*stemp=[UIImage ImageName:@“approve.png”]；
DragView*dragger=[[DragView alloc]initWithImage:stemp]；
dragger.userInteractionEnabled=是；
dragger.center=CGPointMake（160.0f，140.0f）；
[im2添加子视图：拖动器]；
[牵引释放]；
}
}
[self.view addSubview:im2]；
[im2释放]；
}