[ocUI日记]UIImage和UIImageview

 1     //用类方法创建uiimage(png格式可以省略后缀) 2     UIImage *image1 = [UIImage imageNamed:@"001"]; 3     //用路径来获得图片 4     NSString *path = @"";//这是路径地址 5     UIImage *image2 = [UIImage imageWithContentsOfFile:path]; 6     //根据网址来获得图片 7     NSString *url = @"";//这是网址 8     UIImage *image3 = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:url]]]; 9     //uiimage继承自uiview所以uiview的方法他都能用  所以这里就不在一一列举10     float a = image1.size.width;//获得图片的宽度11     float b = image1.size.height;//获得图片的高度12     13     14     //nsdata和uiimage之间的转换15     //nsdata 转换成 uiimage16     NSData *imagedata = [NSData dataWithContentsOfFile:path];17     UIImage *image = [UIImage imageWithData:imagedata];18     //uiimage 转化成nsdata19     NSData *imagedata1 = [NSData dataWithContentsOfFile:path];

 1     //在创建uiimageview的同时添加一个参数进去 2     UIImageView *view1 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"001"]]; 3     //设置uiimageview的位置和大小 4     view1.frame = CGRectMake(20, 20, 100, 100); 5     //设置imageview的大小和image的大小相适应 6     [view1 sizeToFit]; 7     //添加到视图上 8     [self.view addSubview:view1]; 9     //imageview的contentMode属性：这个属性是用来设置图片的显示方式，如居中、居右，是否缩放等10     11     /*12      UIViewContentModeScaleToFill 13      UIViewContentModeScaleaspectFit 14      UIViewContentModeScaleAspectFill 15      UIViewContentModeRedraw 16      UIViewContentModeCenter 17      UIViewContentModeTop 18      UIViewContentModeBottom 19      UIViewContentModeLeft 20      UIViewContentModeRight 21      UIViewContentModeTopLeft 22      UIViewContentModeToPRight 23      UIViewContentModeBottomLeft 24      UIViewContentModeBottomRight25      */26     //凡是没有带Scale的，当图片尺寸超过 ImageView尺寸时，只有部分显示在ImageView中。UIViewContentModeScaleToFill属性会导致图片变形。 UIViewContentModeScaleAspectFit会保证图片比例不变，而且全部显示在ImageView中，这意味着ImageView 会有部分空白。UIViewContentModeScaleAspectFill也会证图片比例不变，但是是填充整个ImageView的，可能只有部 分图片显示出来27     view1.contentMode = UIViewContentModeScaleAspectFill;

    //创建一个uiimageview    UIImageView *imagev1 = [[UIImageView alloc]initWithFrame:CGRectMake(140, 200, 100, 100)];    //创建image    UIImage *image1 = [UIImage imageNamed:@"101"];    UIImage *image2 = [UIImage imageNamed:@"201"];    UIImage *image3 = [UIImage imageNamed:@"301"];    UIImage *image4 = [UIImage imageNamed:@"401"];    UIImage *image5 = [UIImage imageNamed:@"501"];    UIImage *image6 = [UIImage imageNamed:@"601"];    UIImage *image7 = [UIImage imageNamed:@"701"];    //将图片放入数组    NSArray *imagearr = @[image1,image2,image3,image4,image5,image6,image7];    //设置轮播数组    imagev1.animationImages = imagearr;    //设置播放完全部的时间    imagev1.animationDuration = 7;    //设置播放次数  0为无限循环    imagev1.animationRepeatCount = 0;    //开始轮播    [imagev1 startAnimating];    [self.view addSubview:imagev1];