//
//  SmallMapView.h
//  littleMapView
//
//  Created by fuqiang on 13-7-2.
//  Copyright (c) 2013年 fuqiang. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>@interface SmallMapView : UIView//缩放比例
@property (nonatomic,assign,readonly)float scaling;//标示窗口位置的浮动矩形
@property (nonatomic,retain,readonly)CALayer *rectangleLayer;//内容
@property (nonatomic,retain,readonly)CALayer *contentLayer;//被模拟的UIScrollView
@property (nonatomic,retain,readonly)UIScrollView *scrollView;//init
- (id)initWithUIScrollView:(UIScrollView *)scrollView frame:(CGRect)frame;//在UIScrollView的scrollViewDidScroll委托方法中调用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView;//重绘View内容(需要注意。如果在调用reloadSmallMapView 方法的时候，需要更新的内容内有动画。如按钮变色等)
//请用[self performSelector:@selector(reloadSmallMapView:) withObject:nil afterDelay:0.2];
- (void)reloadSmallMapView;
@end

//
//  SmallMapView.m
//  littleMapView
//
//  Created by fuqiang on 13-7-2.
//  Copyright (c) 2013年 fuqiang. All rights reserved.
//

#import "SmallMapView.h"@implementation SmallMapView- (id)initWithUIScrollView:(UIScrollView *)scrollView frame:(CGRect)frame
{self = [super init];if (self) {_scrollView = scrollView;//设置缩略图View尺寸
        [self setFrame:frame];//设置缩略图缩放比例
        [self setScaling:_scrollView];//设置罗略图内容_contentLayer = [self drawContentView:_scrollView frame:frame];[self.layer addSublayer:_contentLayer];//初始化缩略移动视口_rectangleLayer = [[CALayer alloc] init];_rectangleLayer.opacity = 0.5;_rectangleLayer.shadowOffset = CGSizeMake(0, 3);_rectangleLayer.shadowRadius = 5.0;_rectangleLayer.shadowColor = [UIColor blackColor].CGColor;_rectangleLayer.shadowOpacity = 0.8;_rectangleLayer.backgroundColor = [UIColor whiteColor].CGColor;_rectangleLayer.frame = CGRectMake(0, 0, scrollView.frame.size.width * _scaling, scrollView.frame.size.height * _scaling);[self.layer addSublayer:_rectangleLayer];}return self;
}- (void)dealloc
{[_rectangleLayer release];[super dealloc];
}//------
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{[self setScaling:scrollView];float x = scrollView.contentOffset.x;float y = scrollView.contentOffset.y;float h = scrollView.frame.size.height;float w = scrollView.frame.size.width;[self.rectangleLayer setFrame:CGRectMake(x * _scaling, y * _scaling, h * self.scaling, w * self.scaling)];
}//重绘View内容
- (void)reloadSmallMapView
{[_contentLayer removeFromSuperlayer];_contentLayer = [self drawContentView:_scrollView frame:self.frame];[self.layer insertSublayer:_contentLayer atIndex:0];
}//设置缩略图缩放比例
- (void)setScaling:(UIScrollView *)scrollView
{_scaling = self.frame.size.height / scrollView.contentSize.height;
}//复制UIScrollView中内容
- (CALayer *)drawContentView:(UIScrollView *)scrollView frame:(CGRect)frame
{[self setScaling:scrollView];CALayer *layer = [[CALayer alloc] init];layer.frame = frame;for (UIView *view in scrollView.subviews){UIGraphicsBeginImageContext(view.bounds.size);[view.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();CALayer *copyLayer = [CALayer layer];copyLayer.contents = (id)image.CGImage;float x = view.frame.origin.x;float y = view.frame.origin.y;float h = view.frame.size.height;float w = view.frame.size.width;copyLayer.frame = CGRectMake(x * _scaling,y *_scaling,w * _scaling,h * _scaling);[layer addSublayer:copyLayer];}return [layer autorelease];
}
@end