app 头像设置，做成圆形的越来越多。而实现并不是很难，但是图像处理好很重要。
<span style="font-size:14px;">UIImageView *imgV = [[UIImageView alloc]initWithFrame:CGRectMake(200,100 , 100, 100)];
UIImage *image = [UIImage imageNamed:@"1"];
imgV.image = image;
[imgV.layer setCornerRadius:CGRectGetHeight([imgV bounds])/2];
imgV.layer.masksToBounds = YES;
[self.view addSubview: imgV];</span>
上面的代码是将 长宽都是100的imageView 以50为半径 切的一个圆。
另外一个是等比例拉伸的。功能实现是，从本地或者相册选择图片来做头像并作保存。
#import "ViewController.h"
#import <MobileCoreServices/MobileCoreServices.h>
@interface ViewController ()
@property(nonatomic, strong) UIImageView *img;
@property(nonatomic, strong) NSData *fileData;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.img = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:@"selfPhoto.jpg"];
UIImage *selfPhoto = [UIImage imageWithContentsOfFile:imageFilePath];
self.img.image = selfPhoto;
[self.img.layer setCornerRadius:CGRectGetHeight([self.img bounds]) / 2];
self.img.layer.masksToBounds = YES;
[self.view addSubview:_img];
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(100, 300, 100, 50)];
[self.view addSubview:btn];
[btn setTitle:@"换图" forState:UIControlStateNormal];
// [btn addTarget:self action:@selector(takePictureClick) forControlEvents:UIControlEventTouchUpInside];
btn.backgroundColor = [UIColor lightGrayColor];
UIImageView *imgV = [[UIImageView alloc]initWithFrame:CGRectMake(200,100 , 100, 100)];
UIImage *image = [UIImage imageNamed:@"1"];
imgV.image = image;
[imgV.layer setCornerRadius:CGRectGetHeight([imgV bounds])/2];
imgV.layer.masksToBounds = YES;
[self.view addSubview: imgV];
}
//从相册获取图片
-(void)takePictureClick
{
UIActionSheet* actionSheet = [[UIActionSheet alloc]
initWithTitle:@"请选择文件来源"
delegate:self
cancelButtonTitle:@"取消"
destructiveButtonTitle:nil
otherButtonTitles:@"相机",@"本地相簿",nil];
[actionSheet showInView:self.view];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
switch (buttonIndex) {
case 0://照相机
{
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.allowsEditing = YES;
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
// [self presentModalViewController:imagePicker animated:YES];
[self presentViewController:imagePicker animated:YES completion:nil];
}
break;
case 1://本地相簿
{
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.allowsEditing = YES;
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
// [self presentModalViewController:imagePicker animated:YES];
[self presentViewController:imagePicker animated:YES completion:nil];
}
break;
default:
break;
}
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(__bridge NSString *)kUTTypeImage]) {
UIImage *img = [info objectForKey:UIImagePickerControllerEditedImage];
[self performSelector:@selector(saveImage:) withObject:img afterDelay:0.5];
}
else if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(__bridge NSString *)kUTTypeMovie]) {
NSString *videoPath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
self.fileData = [NSData dataWithContentsOfFile:videoPath];
}
// [picker dismissModalViewControllerAnimated:YES];
[picker dismissViewControllerAnimated:YES completion:nil];
}
//保存头像
- (void)saveImage:(UIImage *)image {
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *imageFilePath = [documentsDirectory stringByAppendingPathComponent:@"selfPhoto.jpg"];
NSLog(@"imageFile->>%@",imageFilePath);
success = [fileManager fileExistsAtPath:imageFilePath];
if(success) {
success = [fileManager removeItemAtPath:imageFilePath error:&error];
}
UIImage *smallImage = [self thumbnailWithImageWithoutScale:image size:CGSizeMake(100, 100)];
[UIImageJPEGRepresentation(smallImage, 1.0f) writeToFile:imageFilePath atomically:YES];
//写入文件
UIImage *selfPhoto = [UIImage imageWithContentsOfFile:imageFilePath];//读取图片文件
self.img.image = selfPhoto;
}
//保持原来的长宽比，生成一个缩略图
- (UIImage *)thumbnailWithImageWithoutScale:(UIImage *)image size:(CGSize)asize
{
UIImage *newimage;
if (nil == image) {
newimage = nil;
}
else{
CGSize oldsize = image.size;
CGRect rect;
if (asize.width/asize.height > oldsize.width/oldsize.height) {
rect.size.width = asize.height*oldsize.width/oldsize.height;
rect.size.height = asize.height;
rect.origin.x = (asize.width - rect.size.width)/2;
rect.origin.y = 0;
}
else{
rect.size.width = asize.width;
rect.size.height = asize.width*oldsize.height/oldsize.width;
rect.origin.x = 0;
rect.origin.y = (asize.height - rect.size.height)/2;
}
UIGraphicsBeginImageContext(asize);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);
UIRectFill(CGRectMake(0, 0, asize.width, asize.height));//clear background
[image drawInRect:rect];
newimage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
return newimage;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end