UIImangeView的用法

1.UIImageView 是用来设置图片的显示方式

- (void)viewDidLoad {
    [super viewDidLoad];
//
    UIImageView *imangview=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"3.jpg"]];
    
    imangview.frame=CGRectMake(20, 20, 50, 100);
    //imangview.image=[UIImage imageNamed:@"3.jpg"];
    [self.view addSubview:imangview];
}

运行结果如下：

2.UIImageView的动画效果

#import "ViewController.h"

@interface ViewController ()
{
    UIImageView *image;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
  image=[[UIImageView alloc]initWithFrame:CGRectMake(20,20, 200,200)];
    image.image=[UIImage imageNamed:@"12"];
    //图片的调整方法
    [image sizeToFit];//调整image，调整其尺寸适应图片大小（image的size等于图片的size）

    
    //image.contentMode=UIViewContentModeScaleAspectFit;//以image宽和高中较小的为标准进行等比缩放

    //image.contentMode=UIViewContentModeScaleAspectFill;//以image宽和高中较大的为标准进行等比缩放。如果image尺寸不够，则进行负方向调整，但是不会影响iamge的frame
    //image.contentMode=UIViewContentModeRedraw;
    
    //image.contentMode=UIViewContentModeCenter;//图片显示image的原始大小，显示的位置居于imageview的中心，如果imageview的尺寸不够，则负向调整
    NSLog(@"****%@",NSStringFromCGRect(image.frame));

如下的简单例子

#import "ViewController.h"

@interface ViewController ()
{
    UIImageView *image;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
  image=[[UIImageView alloc]initWithFrame:CGRectMake(20,20, 200,200)];
    NSMutableArray *arr=[[NSMutableArray alloc]initWithCapacity:0];
    for (int i=1; i<6; i++) {
        UIImage *animalim=[UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",i]];//多个图片组成的数组
        [arr addObject:animalim];   
    }
    image.animationImages=arr;//循环播放的图片
    image.animationDuration=5;//循环所有图片所需时间
    image.animationRepeatCount=2;//循环次数，0代表无限循环
    [image startAnimating ];//开始动画
   image.userInteractionEnabled=YES;//允许交互
    [self.view addSubview:image];
    
    UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom];
    button.frame=CGRectMake(20, 20, 20, 20);
    button.backgroundColor=[UIColor redColor];
    [button addTarget:self action:@selector(stopAnimation) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
    
}
-(void)stopAnimation{
    [image stopAnimating];
    image.image=[UIImage imageNamed:@"5.jpg"];//按下停止后，出现的某一背景图片
    NSLog(@"停止播放");
}

3.UIImageView的点击和拖动效果

如下的简单例子

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIImageView *imgview=[[UIImageView alloc]initWithFrame:CGRectMake(50, 20, 100, 100)];
    imgview.image=[UIImage imageNamed:@"1.jpg"];//背景图片1
    
    UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imagetaped:)];
    
    imgview.tag=1;
    //注意一个手势不能添加多个视图
    [imgview addGestureRecognizer:tap];
    imgview.userInteractionEnabled=YES;
   
    UIImageView *imgview1=[[UIImageView alloc]initWithFrame:CGRectMake(50, 130, 100, 100)];
    imgview1.image=[UIImage imageNamed:@"6.jpg"];//背景图片2
    imgview1.tag=2;
    UITapGestureRecognizer *tap1=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imagetaped:)];
     [imgview1 addGestureRecognizer:tap1];
    imgview1.userInteractionEnabled=YES;
    //tap.numberOfTapsRequired=2;//点击次数
    //tap1.numberOfTapsRequired=2;//手指个数、单击
    [self.view addSubview:imgview1];
    
    //设置img和img1不同的手势
    //点动手势
    UITapGestureRecognizer *pan=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(imagetapedpan:)];
    [imgview1 addGestureRecognizer:pan];
    //拖动手势
    UIPanGestureRecognizer *pan1=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(imagetapedpan:)];
    [imgview addGestureRecognizer:pan1];
     [self.view addSubview:imgview];
}
-(void)imagetapedpan:(UITapGestureRecognizer *)pan{
    NSLog(@"****状态%lu",pan.state);
    CGPoint point=[pan locationInView:self.view];
    pan.view.center=point;
}
-(void)imagetaped:(UITapGestureRecognizer *)ges{
    UIView *view=ges .view;
    NSLog(@"######视图被点击%zi",view.tag);
}