UIImagePickerController从本地相册加载图片

/*1.签两个协议协议
UIImagePickerControllerDelegate
UINavigationControllerDelegate
2.两个方法

方法一：
//点击按钮触发的方法
-(void)buttonAction:(UIButton*)button
{

//创建获取本地相册控制器对象
UIImagePickerController *picker = [[UIImagePickerControlleralloc]init];

//成为代理
picker.delegate= self;

//设置相片来源类型
picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;

//是否可以编辑
picker.allowsEditing= YES;

//模态显示本地相册
[selfpresentViewController:pickeranimated:YEScompletion:^{


}]; 

}

方法二：
//当用户选择相册中的某个图片时触发的方法,协议里的方法
//该方法可以获取到选中的图片

• (void)imagePickerController:(UIImagePickerController)picker didFinishPickingMediaWithInfo:(NSDictionary)info
  {

  NSLog(@”info = %@”,info);
  UIImage image=
  [info objectForKey:@”UIImagePickerControllerOriginalImage”];
  //通过tag值取对象
  UIButton button = (UIButton*)[self.viewviewWithTag:10000];
  [button setBackgroundImage:imageforState:UIControlStateNormal];

  //让相册模态消失
  [picker dismissViewControllerAnimated:YEScompletion:^{

}];

}
数据来源类型一共有三种：
enum {
UIImagePickerControllerSourceTypePhotoLibrary ,//来自图库
UIImagePickerControllerSourceTypeCamera ,//来自相机
UIImagePickerControllerSourceTypeSavedPhotosAlbum //来自相册
};
在用这些来源的时候最好检测以下设备是否支持；
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
NSLog(@”支持相机”);
}
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
{
NSLog(@”支持图库”);
}
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
NSLog(@”支持相片库”);
}

调用摄像头来获取资源

• (void)viewDidLoad {
  [super viewDidLoad];
  picker = [[UIImagePickerController alloc]init];
  picker.view.backgroundColor = [UIColor orangeColor];
  UIImagePickerControllerSourceType sourcheType = UIImagePickerControllerSourceTypeCamera;
  picker.sourceType = sourcheType;
  picker.delegate = self;
  picker.allowsEditing = YES;
  }

`