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);}