我們在做應用過程中，難免會遇到要設置用戶頭像這樣的功能，我這里總結了一個調用系統相機，相冊的功能實現，寫出來與大家分享，如有不足還請指正： 1.我們在調用這個功能的時候，一般都有個用來填充圖片的ImageView和點擊ImageView觸發此方法的事件，這里我就寫個ImageView和Button來演示，下面是實現整個功能的代碼：

import "ViewController.h"

define kWidth [UIScreen mainScreen].bounds.size.width

define kHeight [UIScreen mainScreen].bounds.size.height

@interface ViewController ()?{ BOOL isFullScreen; } @property(nonatomic,strong)UIImageView *imageView;

@end

@implementation ViewController

(void)viewDidLoad { [super viewDidLoad];

_imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 200, 200)]; _imageView.backgroundColor = [UIColor grayColor]; [self.view addSubview:_imageView];

UIButton *chooseBtn = [UIButton buttonWithType:UIButtonTypeCustom]; chooseBtn.frame = CGRectMake(100, 30, 100, 40); [chooseBtn addTarget:self action:@selector(chooseImage:) forControlEvents:UIControlEventTouchUpInside]; [chooseBtn setBackgroundColor:[UIColor brownColor]]; [chooseBtn setTitle:@"選擇照片" forState:UIControlStateNormal]; [self.view addSubview:chooseBtn];

}

pragma mark - 保存圖片至沙盒

(void) saveImage:(UIImage)currentImage withName:(NSString)imageName {

NSDataimageData = UIImageJPEGRepresentation(currentImage, 0.5); // 獲取沙盒目錄 NSStringfullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imageName];

// 將圖片寫入文件 [imageData writeToFile:fullPath atomically:NO]; }

pragma mark - image picker delegte

(void)imagePickerController:(UIImagePickerController)picker didFinishPickingMediaWithInfo:(NSDictionary)info { [picker dismissViewControllerAnimated:YES completion:^{}];

UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

[self saveImage:image withName:@"currentImage.png"];

NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"currentImage.png"];

UIImage *savedImage = [[UIImage alloc] initWithContentsOfFile:fullPath];

isFullScreen = NO; [self.imageView setImage:savedImage];

self.imageView.tag = 100;

}

(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [self dismissViewControllerAnimated:YES completion:^{}]; }

-(void)touchesBegan:(NSSet)touches withEvent:(UIEvent)event {

isFullScreen = !isFullScreen;UITouch *touch = [touches anyObject];CGPointtouchPoint = [touch locationInView:self.view];CGPointimagePoint =self.imageView.frame.origin;//touchPoint.x ，touchPoint.y 就是觸點的坐標// 觸點在imageView內，點擊imageView時 放大,再次點擊時縮小if(imagePoint.x<= touchPoint.x&& imagePoint.x+self.imageView.frame.size.width>=touchPoint.x&& imagePoint.y<=? touchPoint.y&& imagePoint.y+self.imageView.frame.size.height>= touchPoint.y){// 設置圖片放大動畫[UIViewbeginAnimations:nilcontext:nil];// 動畫時間[UIViewsetAnimationDuration:1];if(isFullScreen) {// 放大尺寸self.imageView.frame= CGRectMake(0,0, kWidth, kHeight);? ? }else{// 縮小尺寸self.imageView.frame= CGRectMake(100,100,200,200);? ? }// commit動畫[UIViewcommitAnimations];}

}

pragma mark - actionsheet delegate

-(void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex { if (actionSheet.tag == 255) {

NSUInteger sourceType =0;// 判斷是否支持相機if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {switch(buttonIndex) {case0:// 取消return;case1:// 相機sourceType = UIImagePickerControllerSourceTypeCamera;break;case2:// 相冊sourceType = UIImagePickerControllerSourceTypePhotoLibrary;break;? ? ? ? }? ? }else{if(buttonIndex ==0) {return;? ? ? ? }else{? ? ? ? ? ? sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;? ? ? ? }? ? }// 跳轉到相機或相冊頁面UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];? ? imagePickerController.delegate=self;? ? imagePickerController.allowsEditing=YES;? ? imagePickerController.sourceType= sourceType;? ? [selfpresentViewController:imagePickerController animated:YEScompletion:^{}];}

}

(void)chooseImage:(UIButton *)btn {

UIActionSheet *sheet;

// 判斷是否支持相機 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { sheet = [[UIActionSheet alloc] initWithTitle:@"選擇" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"拍照",@"從相冊選擇", nil]; } else {

sheet = [[UIActionSheet alloc] initWithTitle:@"選擇"delegate:selfcancelButtonTitle:nildestructiveButtonTitle:@"取消"otherButtonTitles:@"從相冊選擇",nil];

}

sheet.tag = 255;

[sheet showInView:self.view];

} @end

2.奇怪的是我們不簽代理，功能也能實現，為了保險起見，還是簽訂代理；到此，要實現的基本功能已經完全展示出來了，我們再根據自己項目的需求來改動就可以了。 希望對大家有所幫助。