首先，添加UINavigationControllerDelegate和UIImagePickerControllerDelegate两项protocol.
使用UIImagePickerController，就必须实现UINavigationControllerDelegate这个protocol，因为调用过程中会出现NavigationBar,如果没实现，也不会说运行不了。只是Xcode会直接就给你一个warning.
直接上自己用swift写的一个设置头像的小demo，可直接复制使用。注释清晰明了。
1 //
2 // ViewController.swift
3 // ImageDemo
4 //
5 // Created by fanviwa on 15/4/22.
6 // Copyright (c) 2015年 fanviwa. All rights reserved.
7 //
8
9 import UIKit
10
11 class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
12
13 @IBOutlet weak var imageView: UIImageView!
14 // 初始化图片选择控制器
15 let imagePickerController: UIImagePickerController = UIImagePickerController()
16 var isFullScreen: Bool = false
17
18 override func viewDidLoad() {
19 super.viewDidLoad()
20 // Do any additional setup after loading the view, typically from a nib.
21 self.imageView.frame = CGRectMake(100, 100, 128, 128)
22 }
23
24 override func didReceiveMemoryWarning() {
25 super.didReceiveMemoryWarning()
26 // Dispose of any resources that can be recreated.
27 }
28
29 @IBAction func chooseImage(sender: UIButton) {
30 // 设置代理
31 self.imagePickerController.delegate = self
32 // 设置是否可以管理已经存在的图片或者视频
33 self.imagePickerController.allowsEditing = true
34
35 // 判断是否支持相机
36 if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)){
37 let alertController: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)
38 //在iPad上使用表单（ActionSheet）需要设置描点(anchor point)
39 var popover = alertController.popoverPresentationController
40 if (popover != nil){
41 popover?.sourceView = sender
42 popover?.sourceRect = sender.bounds
43 popover?.permittedArrowDirections = UIPopoverArrowDirection.Any
44 }
45
46 let cameraAction: UIAlertAction = UIAlertAction(title: "拍照换头像", style: .Default) { (action: UIAlertAction!) -> Void in
47 // 设置类型
48 self.imagePickerController.sourceType = UIImagePickerControllerSourceType.Camera
49 self.presentViewController(self.imagePickerController, animated: true, completion: nil)
50 }
51 alertController.addAction(cameraAction)
52
53 let photoLibraryAction: UIAlertAction = UIAlertAction(title: "从相册选择换头像", style: .Default) { (action: UIAlertAction!) -> Void in
54 // 设置类型
55 self.imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
56 //改navigationBar背景色
57 self.imagePickerController.navigationBar.barTintColor = UIColor(red: 171/255, green: 202/255, blue: 41/255, alpha: 1.0)
58 //改navigationBar标题色
59 self.imagePickerController.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()]
60 //改navigationBar的button字体色
61 self.imagePickerController.navigationBar.tintColor = UIColor.whiteColor()
62 self.presentViewController(self.imagePickerController, animated: true, completion: nil)
63 }
64 alertController.addAction(photoLibraryAction)
65
66 let cancelAction: UIAlertAction = UIAlertAction(title: "取消", style: .Cancel, handler: nil)
67 alertController.addAction(cancelAction)
68
69 presentViewController(alertController, animated: true, completion: nil)
70
71 }else{
72 let alertController: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)
73 //设置描点(anchor point)
74 var popover = alertController.popoverPresentationController
75 if (popover != nil){
76 popover?.sourceView = sender
77 popover?.sourceRect = sender.bounds
78 popover?.permittedArrowDirections = UIPopoverArrowDirection.Any
79 }
80
81 let photoLibraryAction: UIAlertAction = UIAlertAction(title: "从相册选择换头像", style: .Default) { (action: UIAlertAction!) -> Void in
82 // 设置类型
83 self.imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
84 //改navigationBar背景色
85 self.imagePickerController.navigationBar.barTintColor = UIColor(red: 171/255, green: 202/255, blue: 41/255, alpha: 1.0)
86 //改navigationBar标题色
87 self.imagePickerController.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()]
88 //改navigationBar的button字体色
89 self.imagePickerController.navigationBar.tintColor = UIColor.whiteColor()
90 self.presentViewController(self.imagePickerController, animated: true, completion: nil)
91 }
92 alertController.addAction(photoLibraryAction)
93
94 let cancelAction: UIAlertAction = UIAlertAction(title: "取消", style: .Cancel, handler: nil)
95 alertController.addAction(cancelAction)
96
97 presentViewController(alertController, animated: true, completion: nil)
98 }
99 }
100
101 //实现ImagePicker delegate 事件
102 func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
103 picker.dismissViewControllerAnimated(true, completion: nil)
104 var image: UIImage!
105 // 判断，图片是否允许修改
106 if(picker.allowsEditing){
107 //裁剪后图片
108 image = info[UIImagePickerControllerEditedImage] as! UIImage
109 }else{
110 //原始图片
111 image = info[UIImagePickerControllerOriginalImage] as! UIImage
112 }
113 /* 此处info 有六个值
114 * UIImagePickerControllerMediaType; // an NSString UTTypeImage)
115 * UIImagePickerControllerOriginalImage; // a UIImage 原始图片
116 * UIImagePickerControllerEditedImage; // a UIImage 裁剪后图片
117 * UIImagePickerControllerCropRect; // an NSValue (CGRect)
118 * UIImagePickerControllerMediaURL; // an NSURL
119 * UIImagePickerControllerReferenceURL // an NSURL that references an asset in the AssetsLibrary framework
120 * UIImagePickerControllerMediaMetadata // an NSDictionary containing metadata from a captured photo
121 */
122 // 保存图片至本地，方法见下文
123 self.saveImage(image, newSize: CGSize(width: 256, height: 256), percent: 0.5, imageName: "currentImage.png")
124 let fullPath: String = NSHomeDirectory().stringByAppendingPathComponent("Documents").stringByAppendingPathComponent("currentImage.png")
125 println("fullPath=\(fullPath)")
126 let savedImage: UIImage = UIImage(contentsOfFile: fullPath)!
127 self.isFullScreen = false
128 self.imageView.image = savedImage
129 //在这里调用网络通讯方法，上传头像至服务器...
130 }
131 // 当用户取消时，调用该方法
132 func imagePickerControllerDidCancel(picker: UIImagePickerController) {
133 self.dismissViewControllerAnimated(true, completion: nil)
134 }
135
136 //保存图片至沙盒
137 func saveImage(currentImage: UIImage, newSize: CGSize, percent: CGFloat, imageName: String){
138 //压缩图片尺寸
139 UIGraphicsBeginImageContext(newSize)
140 currentImage.drawInRect(CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))
141 let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
142 UIGraphicsEndImageContext()
143 //高保真压缩图片质量
144 //UIImageJPEGRepresentation此方法可将图片压缩，但是图片质量基本不变，第二个参数即图片质量参数。
145 let imageData: NSData = UIImageJPEGRepresentation(newImage, percent)
146 // 获取沙盒目录,这里将图片放在沙盒的documents文件夹中
147 let fullPath: String = NSHomeDirectory().stringByAppendingPathComponent("Documents").stringByAppendingPathComponent(imageName)
148 // 将图片写入文件
149 imageData.writeToFile(fullPath, atomically: false)
150 }
151
152 //实现点击图片预览功能，滑动放大缩小，带动画
153 override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
154 self.isFullScreen = !self.isFullScreen
155
156 let touch: UITouch = touches.first as! UITouch
157 let touchPoint: CGPoint = touch.locationInView(self.view)
158 let imagePoint: CGPoint = self.imageView.frame.origin
159 //touchPoint.x ，touchPoint.y 就是触点的坐标
160 // 触点在imageView内，点击imageView时 放大,再次点击时缩小
161 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){
162 // 设置图片放大动画
163 UIView.beginAnimations(nil, context: nil)
164 // 动画时间
165 UIView.setAnimationDuration(1)
166
167 if (isFullScreen) {
168 // 放大尺寸
169 self.imageView.frame = CGRectMake(0, 0, 480, 320)
170 }
171 else {
172 // 缩小尺寸
173 self.imageView.frame = CGRectMake(100, 100, 128, 128)
174 }
175 // commit动画
176 UIView.commitAnimations()
177 }
178 }
179 }
其次，还有一些检查是否有硬件的方法。
1 // 判断设备是否有摄像头 2 UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) 3 // 前面的摄像头是否可用 4 UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front) 5 // 后面的摄像头是否可用 6 UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Rear) 7 // 相册是否可用 8 UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary)
当然，想要修改相册页面为中文还的在Info.plist配置文件中添加"Localized resources can be mixed"属性并设置为YES。
注意：iOS8.0后提示“
Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
”是正常的，暂无解决办法。
希望对你有帮助！
时间： 2024-11-01 00:23:48