ios-UI控件精讲之【6】-UIImageView

原文：http://www.jianshu.com/p/3eaa34649b79

UIImageView属性

创建UIImageView对象

UIImageView *imageView = [[UIImageView alloc] init];

设置frame-->位置和尺寸

imageView.frame = CGRectMake(100, 100, 175, 175);

创建时设置frame

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 267, 400)];

根据图片的大小,设置frame

imageView.frame = CGRectMake(100, 100, image.size.width, image.size.height);

设置背景颜色

imageView.backgroundColor = [UIColor yellowColor];

设置显示的图片

常用创建UIImage的方法:
1.imageName: 后面传入图片的名字
2.imageWithContentOfFile: 图片的全路径
*/
UIImage *image = [UIImage imageNamed:@"1"];

将image对象设置imageView的属性

imageView.image = image;

帧动画

加载所有图片

NSMutableArray *images = [NSMutableArray array];
for (int i = 0; i < 20; i++) {
NSString *imageName = [NSString stringWithFormat:@"%d", i + 1];
UIImage *image = [UIImage imageNamed:imageName];

[images addObject:image];

给imageView设置图片

self.imageView.animationImages = images;

动画执行次数

self.imageView.animationRepeatCount = 2;
默认是0,无限循环

动画执行时间

self.imageView.animationDuration = 1;

开始动画

[self.imageView startAnimating];

停止动画

[self.imageView stopAnimating];
//清空数组里的图片
self.standImages = nil;
self.imageView.animationImages = nil;

过一个时间执行另外一个动作

[self performSelector:@selector(stand) withObject:nil afterDelay:zhaoTime];

播放声音

根据音频文件名加载资源

NSURL *url = [[NSBundle mainBundle] URLForResource:soundName withExtension:@"mp3"];

创建AVPlayerItem的对象

AVPlayerItem *Item = [[AVPlayerItem alloc] initWithURL:url];

创建AVPlayer对象

AVPlayer * player = [[AVPlayer alloc]initWithPlayerItem:Item];

播放声音

[self.player play];

改变声音播放速率

self.player.rate = 1.5;

另一个Item

AVPlayerItem *item2 = [[AVPlayerItem alloc] initWithURL:url];

替换前一个Item

[self.player replaceCurrentItemWithPlayerItem:item2];

播放声音

[self.player play];