在UIScrollView内旋转UIView，边界和中心点

Question

我有一个滚动视图，其中包含我绘制一些图像的UIView子类。我希望能够旋转滚动视图的内容，但我似乎无法弄清楚如何应用CGAffineTransformMakeRotation并保持滚动视图的功能（内部视图可拖动和可移动）。

我的最终目标是制作一张带有动态定位标记的地图，这些标记在使用集成罗盘旋转时可伸缩和缩放。

（你可能已经猜到我是iOS开发新手，所以我很失落）。

我的ViewController包含ScrollView：

#import "ViewController.h"

@implementation ViewController
@synthesize scrollView;
@synthesize mapView;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    CGRect mapFrame;
    mapFrame.origin = CGPointMake(0, 0);
    mapFrame.size = CGSizeMake(450, 476);
    mapView.frame = mapFrame;

    scrollView.delegate = self;
    scrollView.bounces = NO;
    scrollView.scrollsToTop = NO;
    scrollView.decelerationRate = UIScrollViewDecelerationRateFast;
    scrollView.contentSize = CGSizeMake(450, 476);
    scrollView.minimumZoomScale = 0.7;
    scrollView.maximumZoomScale = 6.0;
    scrollView.zoomScale = 0.7;
}

- (void)viewDidUnload
{
    [self setScrollView:nil];
    [self setMapView:nil];
    [super viewDidUnload];
}

-(UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView 
{ 
    return mapView;
}
-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{

}
@end

我的UIView子类嵌入在ScrollView中：

#import "MapView.h"

@implementation MapView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}
- (void)drawRect:(CGRect)rect
{
    // do some drawing
    UIImage *myImage = [UIImage imageNamed:@"map.jpg"];
    CGRect rectangle = CGRectMake(0,0,450,476);
    [myImage drawInRect:rectangle];

    UIImage *testAnimationImage = [UIImage imageNamed:@"star_marker.png"];
    UIImageView *testAnimationView = [[UIImageView alloc] initWithImage:testAnimationImage];
    testAnimationView.frame = CGRectMake(30, 30, 34, 34); 
    [self addSubview:testAnimationView];

    // rotate the map - this is where I get stuck
    CGAffineTransform transform = CGAffineTransformMakeRotation(45 / 180.0 * M_PI); 
    self.transform = transform; 

    // center the rotation point
    CGRect frame = [self frame];
    frame.origin.x = 450/2;
    frame.origin.y = 476/2;
    [self setFrame:frame];

}
@end

编辑：

将视图设置移出drawRect后，继续更新代码。

的ViewController：

#import "ViewController.h"

@implementation ViewController
@synthesize scrollView;
@synthesize mapView;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];

    mapView = [[MapView alloc] initWithFrame:CGRectMake(0, 0, 450, 476)];
    [scrollView addSubview:mapView];

    scrollView.delegate = self;

    scrollView.bounces = NO;
    scrollView.scrollsToTop = NO;
    scrollView.decelerationRate = UIScrollViewDecelerationRateFast;

    scrollView.contentSize = CGSizeMake(450, 476);
    scrollView.minimumZoomScale = 0.7;
    scrollView.maximumZoomScale = 6.0;
    scrollView.zoomScale = 0.7;

}

-(UIView *) viewForZoomingInScrollView:(UIScrollView *)scrollView 
{ 
    return mapView;
}
-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{

}

@end

MapView的：

#import "MapView.h"

@implementation MapView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self layoutView];
    }
    return self;
}

- (void)layoutView {


    UIImage *myImage = [UIImage imageNamed:@"map.jpg"];
    CGRect rectangle = CGRectMake(0,0,450,476);

    UIImageView *myImageView = [[UIImageView alloc] initWithImage:myImage];
    myImageView.frame = rectangle;

    [self addSubview:myImageView];

    UIImage *testAnimationImage = [UIImage imageNamed:@"star_marker.png"];
    UIImageView *testAnimationView = [[UIImageView alloc] initWithImage:testAnimationImage];
    testAnimationView.frame = CGRectMake(30, 30, 34, 34); 
    [self addSubview:testAnimationView];

}

- (void)drawRect:(CGRect)rect
{ 

}

@end