iOS 拍照和相机的基本使用
@interface ViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate,UIActionSheetDelegate>
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *butt = [UIButton buttonWithType:UIButtonTypeCustom];
butt.frame = CGRectMake(100, 100, 50, 50);
[butt setTitle:@"点击" forState:UIControlStateNormal];
[butt setBackgroundColor:[UIColor grayColor]];
[butt addTarget:self action:@selector(goShowAlertView:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:butt];
}
- (void)goShowAlertView:(id)sender
{
double version = [[UIDevice currentDevice].systemVersion doubleValue];//判定系统版本。
if(version>=8.0f){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
[alertController addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self selecetPhotoAndLibary:0];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self selecetPhotoAndLibary:1];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"取消");
}]];
[self presentViewController:alertController animated:YES completion:nil];
}else{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
UIActionSheet *sheetView = [[UIActionSheet alloc] initWithTitle:@"提示" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"拍照",@"相册",@"取消", nil];
#pragma clang diagnostic pop
sheetView.actionSheetStyle = UIActionSheetStyleDefault;
[sheetView showInView:self.view];
}
}
#pragma mark actionSheet_delegate 点击事件
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex NS_DEPRECATED_IOS(2_0, 8_3) __TVOS_PROHIBITED{
[self selecetPhotoAndLibary:buttonIndex];
}
#pragma mark-one anTag 1是拍照，2是相册
- (void)selecetPhotoAndLibary:(NSInteger)anTag{
switch (anTag) {
case 0:
{
UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
//设置拍照后的图片可被编辑
picker.sourceType=UIImagePickerControllerSourceTypeCamera;
picker.allowsEditing = YES;
picker.sourceType = sourceType;
[self presentViewController:picker animated:YES completion:nil];
}
else
{
UIAlertView *aletView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"模拟器不可用" delegate:nil
cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[aletView show];
}
break;
}
case 1:
{
UIImagePickerController *picker=[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.allowsEditing=YES;
[self presentViewController:picker animated:YES completion:nil];
break;
}
default:
break;
}
}
#pragma mark-onnce 代理方法
- (void)p_w_picpathPickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
UIImage *editedImage = [info objectForKey:@"UIImagePickerControllerEditedImage"];
editedImage = [self makeThumbnailFromImage:editedImage scale:1.0f];
NSString *homePath = [NSHomeDirectory() stringByAppendingString:@"/Documents"];
NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];
NSTimeInterval last = [dat timeIntervalSince1970]*1000;
NSString *p_w_picpathViews = [homePath stringByAppendingFormat:@"/%f.jpeg", last];
//路径，图片的本地路径 NSString *p_w_picpathPath = [NSString stringWithFormat:@"/%f.jpeg", last];
[UIImageJPEGRepresentation(editedImage, 1.0f) writeToFile:p_w_picpathViews atomically:YES];
[self dismissViewControllerAnimated:YES completion:^{
}];
}
#pragma mark-onnce 手动实现图片压缩，可以写到分类里，封装成常用方法。按照大小进行比例压缩，改变了图片的size。
- (UIImage *)makeThumbnailFromImage:(UIImage *)srcImage scale:(double)p_w_picpathScale {
UIImage *thumbnail = nil;
CGSize p_w_picpathSize = CGSizeMake(srcImage.size.width * p_w_picpathScale, srcImage.size.height * p_w_picpathScale);
if (srcImage.size.width != p_w_picpathSize.width || srcImage.size.height != p_w_picpathSize.height)
{
UIGraphicsBeginImageContext(p_w_picpathSize);
CGRect p_w_picpathRect = CGRectMake(0.0, 0.0, p_w_picpathSize.width, p_w_picpathSize.height);
[srcImage drawInRect:p_w_picpathRect];
thumbnail = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
else
{
thumbnail = srcImage;
}
return thumbnail;
}
#pragma mark-onnce 取消的代理方法
- (void)p_w_picpathPickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissViewControllerAnimated:YES completion:^{
}];
}
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