相册、相机UIImagePickerController 相册、相机的调用都是用此类，sourceType不一致协议UINavigationControllerDelegateUIImagePickerControllerDelegate当你选择照片或拍照后回传图片信息imagePickerController:didFinishPickingMediaWithInfo:当你点击取消键时回调（若实现此方法，需手动返回上一界面）imagePickerControllerDidCancel:
例子:将从系统相框选出照片作为屏幕背景建一个工具类.m中#import#import@interface ImageTool : NSObject//实现一个方法压缩图片+(UIImage *)resizeImagetoSize:(CGSize)size WithImage:(UIImage*)image;@end工具类.h中#import "ImageTool.h"@implementation ImageTool//实现一个类方法压 缩图片+(UIImage *)resizeImagetoSize:(CGSize)size WithImage:(UIImage*)image{// 重绘 UIGraphicsBeginImageContext(size); // 获取上下文对象 CGContextRef context=UIGraphicsGetCurrentContext(); // 缩放 CGContextTranslateCTM(context, 0, size.height); CGContextScaleCTM(context, 1,-1); CGContextDrawImage(context, CGRectMake(0, 0, size.width, size.height), image.CGImage);// 得到UIImage UIImage *resultImage=UIGraphicsGetImageFromCurrentImageContext(); // 结束绘图 UIGraphicsEndImageContext(); return resultImage;}@endVC类.h中#import "ViewController.h"#import "ImageTool.h"//定义屏幕宽高的宏#define HEIGHT self.view.frame.size.height#define WIDTH self.view.frame.size.width@interface ViewController ()@end
@implementation ViewController
{
UIActionSheet *_actionSheet;
UIImageView * _background;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self creatBackground];
[self creatActionSheet];
[self creatButton];
}
//创建图片背景
-(void)creatBackground
{
_background =[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
_background.backgroundColor=[UIColor yellowColor];
[self.view addSubview:_background];
}
//创建
-(void)creatActionSheet
{
_actionSheet=[[UIActionSheet alloc]initWithTitle:@"请选择功能" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"相册",@"相机", nil];
}
#pragma mark 实现ActionSheet的协议方法
//实现ActionSheet的协议方法
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
// switch 传入你点击的按钮索引
switch (buttonIndex) {
case 0:
{
// 相册
NSLog(@"相册");
// 判断是否可以调用相册
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
// 调用相册
[self loadImageWithSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
}
else{
// 使用Alertview 提示相册不可用
[self creatAlertViewWithMessage:@"相册不可用"];
}
}
break;
case 1:
{
// 相机
NSLog(@"相机");
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
[self loadImageWithSourceType:UIImagePickerControllerSourceTypeCamera];
}
else{
[self creatAlertViewWithMessage:@"相机不可用"];
}
}
break;
default:
break;
}
}
#pragma mark 实现UIController协议方法
//实现UIController协议方法
//当你选择照片或拍照后选择回传
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSLog(@"回传的信息%@",info);
if ([info valueForKey:UIImagePickerControllerOriginalImage]) {
// 如果取到了值
UIImage *orgImage=info[UIImagePickerControllerOriginalImage];
UIImage *scaleImage=[ImageTool resizeImagetoSize:CGSizeMake(50, 50) WithImage:orgImage];
// 把图片赋给背景
_background.image=scaleImage;
}
[picker dismissViewControllerAnimated:YES completion:nil];
}
//当你点击取消按钮时候回调(若实现此方法需手动返回上一界面)
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
NSLog(@"取消信息");
[picker dismissViewControllerAnimated:YES completion:nil];
}
#pragma mark 自定义的方法
//封装一个创建AlertView的方法来显示相机 相册可不可用
-(void)creatAlertViewWithMessage:(NSString *)message
{
UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:nil message:message delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:nil, nil];
[alertView show];
}
//封装一个相机相册的方法
-(void)loadImageWithSourceType:(UIImagePickerControllerSourceType)sourceType
{
// 创建了一个pickcontroller对象
UIImagePickerController *picker=[[UIImagePickerController alloc]init];
// 指定picker类型
picker.sourceType=sourceType;
//指定代理对象
picker.delegate=self;
//推出VC 一般都是用模态的方式推出pickerController(本质是个VC)
[self presentViewController:picker animated:YES completion:nil];
}
//创建按钮触发
-(void)creatButton
{
UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom];
[button setFrame:CGRectMake((WIDTH-60)/2, (HEIGHT-40)/2, 60, 40)];
[button setTitle:@"功能" forState:UIControlStateNormal];
[button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[button addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
//点击按钮的方法回调
-(void)onClick:(UIButton *)button
{
[_actionSheet showInView:self.view];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
由于我水平一般 以上内容仅供参考如有不适合的地方还请见谅!!!
