实现图片的滚动，并且自动停止在每张图片上
- ( void )viewDidLoad{ [ super viewDidLoad ]; UIScrollView *scrollView = [[ UIScrollView alloc ] initWithFrame : CGRectMake ( 0 , 20 , 320 , 200 )]; for ( int i= 1 ; i<= 8 ; ++i) { UIImage *image = [ UIImage imageNamed :[ NSString stringWithFormat : @"%d.jpg" , i]]; UIImageView *imageView = [[ UIImageView alloc ] initWithFrame : CGRectMake ( 320 *(i- 1 ), 0 , 320 , 200 )]; imageView. image = image; [scrollView addSubview :imageView]; } scrollView. bounces = NO ; scrollView. showsHorizontalScrollIndicator = NO ; scrollView. pagingEnabled = YES ; scrollView. contentSize = CGSizeMake ( 320 * 8 , 200 ); [ self . view addSubview :scrollView]; // Do any additional setup after loading the view. }
将图片猩猩假如scrollView 中
- ( void )viewDidLoad{ [ super viewDidLoad ]; UIScrollView *scrollView = [[ UIScrollView alloc ] initWithFrame : CGRectMake ( 10 , 30 , 300 , 400 )]; scrollView. backgroundColor = [ UIColor orangeColor ]; UIImage *image = [ UIImage imageNamed : @"1.jpg" ]; UIImageView *imageView = [[ UIImageView alloc ] initWithImage :image]; [scrollView addSubview :imageView]; scrollView. contentSize = CGSizeMake (image. size . width , image. size . height ); [ self . view addSubview :scrollView]; // Do any additional setup after loading the view. }
手势：
@interface QFViewController ()< UIGestureRecognizerDelegate ]]> @property ( weak , nonatomic ) IBOutlet UILabel *myLabel; @end @implementation QFViewController{ CGFloat preScale;}- ( void )viewDidLoad{ [ super viewDidLoad ]; // 手势 /* UITapGestureRecognizer;// 单击 UIPinchGestureRecognizer;// 缩放手势 UIRotationGestureRecognizer;// 旋转手势 UISwipeGestureRecognizer;// 扫动手势（上下左右） UIPanGestureRecognizer;// 滑动手势 */ UIPinchGestureRecognizer *pinchGR=[[ UIPinchGestureRecognizer alloc ] initWithTarget : self action : @selector (onPinch:)]; [ self . myLabel addGestureRecognizer :pinchGR]; //label 、 imageview 默认不接受人机交互，要手动设置 self . myLabel . userInteractionEnabled = YES ; preScale = 1 ;}-( void )onPinch:( UIPinchGestureRecognizer *)pGR{ NSLog ( @"%@" ,pGR); NSLog ( @"%f" ,pGR. scale ); /* UIGestureRecognizerStateBegan, UIGestureRecognizerStateChanged, UIGestureRecognizerStateEnded, */ if (pGR. state == UIGestureRecognizerStateChanged ) { self . myLabel . font =[ UIFont systemFontOfSize : 17 * preScale *pGR. scale ]; } if (pGR. state == UIGestureRecognizerStateEnded ) { preScale = preScale *pGR. scale ; } } @end
IOS UI 第八篇：基本UI