小编Tom*_*zdz的帖子

我有一个UIView内部UIScrollView.每当UIScrollView变焦的变化,我想重绘整个UIView在新的缩放级别.

在iOS <3.2中,我通过调整UIView内部大小UIScrollView来使其成为新大小,然后将转换设置回Identity,以便它不会尝试进一步调整大小.但是,如果iOS> = 3.2,更改标识也会更改UIScrollView缩放比例属性.

结果是每当我缩放(比如说2x)时,我都会将嵌入器调整UIView为合适的大小,并重新绘制它.但是现在(因为我将转换重置为Identity),UIScrollView再次在zoomScale 1处思考它,而不是zoomScale 2.因此,如果我将maxZoomScale设置为2,它仍然会尝试进一步缩放,这是错误的.

我想过使用它CATiledLayer,但我不认为这对我来说已经足够了,因为我想在每次缩放后重绘,而不仅仅是像它试图做的某些缩放阈值.

有谁知道如何正确重绘UIView缩放？

我正在显示一个MFMailComposeViewController,如下所示:

- (IBAction) contactUs: (id) sender {
    [Tracker trackContactUsPressed: [MFMailComposeViewController canSendMail]];

    if ([MFMailComposeViewController canSendMail] == NO) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Email Error"
                                                        message: @"Email has not been configured on this device.  Please send us an email at\nFOO@BAR.com"
                                                       delegate: self
                                              cancelButtonTitle: @"OK"
                                              otherButtonTitles: nil];
        [alert show];
        [alert release];
    } else {

        MFMailComposeViewController *controller = [[[MFMailComposeViewController alloc] init] autorelease];

        [controller setSubject:@"Comments about FOO"];            

        [controller setToRecipients: [NSArray arrayWithObject: @"FOO@BAR.com"]];
        [controller setMailComposeDelegate: self];

        [[self parentViewController] presentModalViewController:controller animated:YES];
    }
}

然后我的代表看起来像这样:

- …

我有两个实体定义如下：

@Entity
@Table(name = "shapes")
public class Shape {
    @Id
    private int id;

    @Column(nullable = false)
    private String name;

    @OneToMany(mappedBy="shape", fetch = FetchType.EAGER)
    private List<ShapeElement> shapeElements;

    public int getId() {
        return id;
    }
}

和：

@Entity
@IdClass(ShapeElementPK.class)
@Table(name = "shape_elements")
public class ShapeElement {
    @Id
    @ManyToOne
    @JoinColumn(name = "shape_id")
    private Shape shape;

    @Id
    @Column(name = "x_delta")
    private int xDelta;

    @Id
    @Column(name = "y_delta")
    private int yDelta;
}

使用以下 IdClass：

@Embeddable
public class ShapeElementPK implements Serializable {
    private static final long …