IOS UI 第八篇：基本UI

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