scrollview 圖片放大 捏合 瓦片地圖 相關注意事項，scrollview瓦片

scrollview 圖片放大 捏合 瓦片地圖 相關注意事項，scrollview瓦片

就職文博公司要為博物館做APP 涉及到瓦片地圖的編寫 在這裡總結一些開發中遇到的問題 (將會不斷更新 也是學習階段)

著急寫項目的同學 可以直接看code4上現成的瓦片地圖代碼：http://www.code4app.com/ios/Tiled-Scroll-View/4fba3fd66803fa8413000000

1. 首先實現利用scrollview實現圖片的縮放： 需要設定

maximumZoomScale;     // default is 1.0. must be > minimum zoom scale to enable zooming  *****只有設定了這個屬性值大於1.0 才能實現縮放效果

下面上代碼

//.h 檔案#import <UIKit/UIKit.h>@interface HDMapView : UIScrollView <UIScrollViewDelegate>-(instancetype)initWithFrame:(CGRect)frame andContentSize:(CGSize)contentSize;-(void)setMapImage:(UIImage*)image;@end//.m 檔案#import "HDMapView.h"@interface HDMapView ()@property(strong,nonatomic)UIImageView *myImageView;@end@implementation HDMapView-(instancetype)initWithFrame:(CGRect)frame andContentSize:(CGSize)contentSize{    self = [super initWithFrame:frame];    if (self) {                self.maximumZoomScale=17;                self.frame = frame;        self.delegate = self;        self.contentSize = contentSize;                        self.myImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, contentSize.width, contentSize.height)];        self.myImageView.userInteractionEnabled = YES;        [self addSubview:self.myImageView];                        UITapGestureRecognizer *twiceTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapTwice)];        twiceTap.numberOfTapsRequired = 2;        twiceTap.numberOfTouchesRequired = 1;        [self.myImageView addGestureRecognizer:twiceTap];    }        return self;}-(void)tapTwice{    if (self.zoomScale > 3) {        [self setZoomScale:1.0 animated:YES];    }    else    {        CGFloat a = self.zoomScale;        a++;        [self setZoomScale:a animated:YES];;    }}-(void)setMapImage:(UIImage*)image{    self.myImageView.image = image;}#pragma mark - UIScrollViewDelegate-(UIView*)viewForZoomingInScrollView:(UIScrollView *)scrollView{    return self.myImageView;}-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{    [self setZoomScale:scale animated:YES];}