必須至少有三個步驟:
一,實現協議
二,建立關係
三,設置縮放的範圍
具體見代碼:
#import "ViewController.h"
@interface ViewController () <UIScrollViewDelegate> //一定要先遵守這個協議
@property (weak, nonatomic) IBOutlet UIScrollView *ScrollView;
@property (weak, nonatomic) IBOutlet UIImageView *minionPic;
@end
@implementation ViewController
//滾動過程中,一直會調用該方法
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
//NSLog(@"scrollViewDidScroll");
}
//開始滾動時調用該方法,在拖拽一次,該方法只調用一次且爲最初開始時調用一次
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
//NSLog(@"scrollViewWillBeginDragging");
}
//當用戶開始縮放動作時代理要觸發的事件
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
{
NSLog(@"scrollViewWillBeginZooming");
}
//當用戶縮放時,要設置綻放哪個View?
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.minionPic;
}
- (void)viewDidLoad {
[super viewDidLoad];
//設置ScrollView的內容大小contentSize
self.ScrollView.contentSize= self.minionPic.frame.size;
//綁定代理,建立ScrollView與代理的關係
self.ScrollView.delegate = self;
//設置縮放的範圍
self.ScrollView.minimumZoomScale = 0.2;
self.ScrollView.maximumZoomScale =2.0;
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end