1.判斷郵箱格式是否正確的代碼：
// 利用正則表達式驗證
-( BOOL )isValidateEmail:( NSString *)email
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}" ;
NSPredicate *emailTest = [ NSPredicate predicateWithFormat : @"SELF MATCHES%@",emailRegex];
return [emailTest evaluateWithObject :email];
}
2.圖片壓縮
用法： UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)];
// 壓縮圖片
- ( UIImage *)imageWithImageSimple:( UIImage *)image scaledToSize:( CGSize )newSize
{
// Create a graphics image context
UIGraphicsBeginImageContext (newSize);
// Tell the old image to draw in this newcontext, with the desired
// new size
[image drawInRect : CGRectMake ( 0 , 0 ,newSize. width ,newSize. height )];
// Get the new image from the context
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext ();
// End the context
UIGraphicsEndImageContext ();
// Return the new image.
return newImage;
}
3.親測可用的圖片上傳代碼
- ( IBAction )uploadButton:( id )sender {
UIImage *image = [ UIImage imageNamed : @"1.jpg" ]; // 圖片名
NSData *imageData = UIImageJPEGRepresentation (image, 0.5 );// 壓縮比例
NSLog ( @" 字節數 :%i" ,[imageData length]);
// post url
NSString *urlString = @"http://192.168.1.113:8090/text/UploadServlet" ;
// 服務器地址
// setting up the request object now
NSMutableURLRequest *request = [[ NSMutableURLRequest alloc ] init ] ;
[request setURL :[ NSURL URLWithString :urlString]];
[request setHTTPMethod : @"POST" ];
//
NSString *boundary = [ NSString stringWithString : @"---------------------------14737809831466499882746641449" ];
NSString *contentType = [ NSString stringWithFormat : @"multipart/form-data;boundary=%@",boundary];
[request addValue :contentType forHTTPHeaderField : @"Content-Type" ];
//
NSMutableData *body = [ NSMutableData data ];
[body appendData :[[ NSString stringWithFormat : @"\r\n--%@\r\n" ,boundary] dataUsingEncoding : NSUTF8StringEncoding ]];
[body appendData :[[ NSString stringWithString : @"Content-Disposition:form-data; name=\"userfile\"; filename=\"2.png\"\r\n" ] dataUsingEncoding : NSUTF8StringEncoding ]]; // 上傳上去的圖片名字
[body appendData :[[ NSString stringWithString : @"Content-Type: application/octet-stream\r\n\r\n" ] dataUsingEncoding : NSUTF8StringEncoding ]];
[body appendData :[ NSData dataWithData :imageData]];
[body appendData :[[ NSString stringWithFormat : @"\r\n--%@--\r\n" ,boundary] dataUsingEncoding : NSUTF8StringEncoding ]];
[request setHTTPBody :body];
// NSLog(@"1-body:%@",body);
NSLog ( @"2-request:%@" ,request);
NSData *returnData = [ NSURLConnection sendSynchronousRequest :request returningResponse :nil error : nil ];
NSString *returnString = [[ NSString alloc ] initWithData :returnData encoding :NSUTF8StringEncoding ];
NSLog ( @"3- 測試輸出： %@" ,returnString );
4.給imageView加載圖片
UIImage *myImage = [ UIImage imageNamed : @"1.jpg" ];
[ imageView setImage :myImage];
[ self . view addSubview : imageView ];
5.對圖庫的操作
選擇相冊：
UIImagePickerControllerSourceTypesourceType=UIImagePickerControllerSourceTypeCamera;
if (![UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
}
UIImagePickerController * picker = [[UIImagePickerControlleralloc]init];
picker.delegate = self;
picker.allowsEditing=YES;
picker.sourceType=sourceType;
[self presentModalViewController:picker animated:YES];
選擇完畢：
-(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissModalViewControllerAnimated:YES];
UIImage * image=[info objectForKey:UIImagePickerControllerEditedImage];
[self performSelector:@selector(selectPic:) withObject:imageafterDelay:0.1];
}
-(void)selectPic:(UIImage*)image
{
NSLog(@"image%@",image);
imageView = [[UIImageView alloc] initWithImage:image];
imageView.frame = CGRectMake(0, 0, image.size.width, image.size.height);
[self.viewaddSubview:imageView];
[self performSelectorInBackground:@selector(detect:) withObject:nil];
}
detect 為自己定義的方法，編輯選取照片後要實現的效果
取消選擇：
-(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker
{
[picker dismissModalViewControllerAnimated:YES];
}
6.跳到下個View
nextWebView = [[ WEBViewController alloc ] initWithNibName : @"WEBViewController" bundle :nil ];
[ self presentModalViewController : nextWebView animated : YES ];
7.創建一個UIBarButton右邊按鈕
UIBarButtonItem *rightButton = [[ UIBarButtonItem alloc ] initWithTitle : @" 右邊 " style :UIBarButtonItemStyleDone target : self action : @selector (clickRightButton)];
[ self . navigationItem setRightBarButtonItem :rightButton];
8.設置navigationBar隱藏
self . navigationController . navigationBarHidden = YES ;//
9.UIlabel多行文字自動換行 （自動折行）
UIView *footerView = [[UIView alloc]initWithFrame:CGRectMake(10, 100, 300, 180)];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 300, 150)];
label.text = @"Hello world! Hello world!Hello world! Hello world! Hello world! Hello world! Hello world! Hello world!Hello world! Hello world! Hello world! Hello world! Hello world! Helloworld!";
// 背景顏色為紅色
label.backgroundColor = [UIColor redColor];
// 設置字體顏色為白色
label.textColor = [UIColor whiteColor];
// 文字居中顯示
label.textAlignment = UITextAlignmentCenter;
// 自動折行設置
label.lineBreakMode = UILineBreakModeWordWrap;
label.numberOfLines = 0;
10.代碼生成Button
CGRect frame = CGRectMake ( 0 , 400 , 72.0 , 37.0 );
UIButton *button = [ UIButton buttonWithType : UIButtonTypeRoundedRect ];
button. frame = frame;
[button setTitle : @" 新添加的按鈕 " forState: UIControlStateNormal ];
button. backgroundColor = [ UIColor clearColor ];
button. tag = 2000 ;
[button addTarget : self action : @selector (buttonClicked:) forControlEvents :UIControlEventTouchUpInside ];
[ self . view addSubview :button];
10.2在xib文件中已經創建好Button，通過tag獲取按鈕
UIButton *testButton= (UIButton*)[self.view viewWithTag:100];
[testButton addTarget:self action:@selector(test:) forControlEvents:UIControlEventTouchUpInside];
//按鈕事件
-(void) test: (id) sender{
UIAlertView *av = [[[UIAlertView alloc] initWithTitle:@"ceshi" message:@"test11111" delegate:nil cancelButtonTitle:@"OK"otherButtonTitles:nil] autorelease];
[av show];
}
11.讓某個控件在View的中心位置顯示：
（某個控件，比如 label ， View ） label . center = self . view . center；
12.自定義text各種效果：
cell.backgroundColor = [UIColorscrollViewTexturedBackgroundColor];
// 設置文字的字體
cell.textLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:100.0f];
// 設置文字的顏色
cell.textLabel.textColor = [UIColor orangeColor];
// 設置文字的背景顏色
cell.textLabel.shadowColor = [UIColor whiteColor];
// 設置文字的顯示位置
cell.textLabel.textAlignment = UITextAlignmentCenter;
13.隱藏statusBar：
在程序的 viewDidLoad 中加入
[[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO];
14.更改AlertView背景：
UIAlertView *theAlert = [[[UIAlertViewalloc] initWithTitle:@"Atention"
message: @"I'm a Chinese!"
delegate:nil
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"Okay",nil] autorelease];
[theAlert show];
UIImage *theImage = [UIImageimageNamed:@"loveChina.png"];
theImage = [theImage stretchableImageWithLeftCapWidth:0topCapHeight:0];
CGSize theSize = [theAlert frame].size;
UIGraphicsBeginImageContext(theSize);
[theImage drawInRect:CGRectMake(5, 5, theSize.width-10, theSize.height-20)];// 這個地方的大小要自己調整，以適應 alertview 的背景顏色的大小。
theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
theAlert.layer.contents = (id)[theImage CGImage];
15.鍵盤透明：
textField.keyboardAppearance = UIKeyboardAppearanceAlert;
16.狀態欄的網絡活動風火輪是否旋轉：
[UIApplication sharedApplication].networkActivityIndicatorVisible ， 默認值是 NO 。
17.截取屏幕圖片：
// 創建一個基於位 圖的圖形上下文並指定大小為CGSizeMake(200,400)
UIGraphicsBeginImageContext(CGSizeMake(200,400));
//renderInContext 呈現接受者及其子范圍到 指定的上下文
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
// 返回 一個基於當前圖形上下文的圖片
UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext();
// 移除棧頂 的基於當前位圖的圖形上下文
UIGraphicsEndImageContext();
// 以 png 格式 返回指定圖片的數據
imageData = UIImagePNGR epresentation(aImage);
18.更改cell選中的背景：
UIView *myview = [[UIView alloc] init];
myview.frame = CGRectMake(0, 0, 320, 47);
myview.backgroundColor = [UIColorcolorWithPatternImage:[UIImage imageNamed:@"0006.png"]];
cell.selectedBackgroundView = myview;:
19.顯示圖片：
CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f);
UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];
[myImage setImage:[UIImage imageNamed:@"myImage.png"]];
myImage.opaque = YES; //opaque 是否透明
[self.view addSubview:myImage];
20.能讓圖片適應框的大小（beta）
NSString*imagePath = [[NSBundle mainBundle] pathForResource:@"XcodeCrash"ofType:@"png"];
UIImage *image = [[UIImage alloc]initWithContentsOfFile:imagePath];
UIImage *newImage= [image transformWidth:80.f height:240.f];
UIImageView *imageView = [[UIImageView alloc]initWithImage: newImage];
[newImagerelease];
[image release];
[self.view addSubview:imageView];
21. 實現點擊圖片進行跳轉的代碼：（生成一個帶有背景圖片的button，給button綁定想要的事件）
UIButton *imgButton=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 120, 120)];
[imgButton setBackgroundImage:(UIImage *)[self.imgArray objectAtIndex:indexPath.row] forState:UIControlStateNormal];
imgButton.tag=[indexPath row];
[imgButton addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
22.鍵盤回收：
1).增加一個button，相應touch down事件，隱藏鍵盤。這種方法，太山寨了。為了相應一個事件增加一個button太不值得的。
.h
- (IBAction)dismissKeyBoard:(id)sender;
.m
- (IBAction)dismissKeyBoard:(id)sender {
[testText resignFirstResponder];
}
2).第二種方法：在背景圖片上添加Tap事件，相應單擊處理。這種方法，很好代替了button方式，但是如果UI上沒有背景圖片，這種方法又回到到第一種山寨的方法行列中。
// 添加帶有處理時間的背景圖片
UIImageView *backView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
backView.image = [UIImage imageNamed:@"small3.png"];
backView.userInteractionEnabled = YES;
UITapGestureRecognizer *singleTouch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard:)];
[backView addGestureRecognizer:singleTouch];
backView.tag = 110;
[self.view addSubview:backView];
-(void)dismissKeyboard:(id)sender{
[text resignFirstResponder];
}
3).在xib文件中，修改xib文件的objects屬性，默認是view屬性，我們可以修改為UIControl屬性，從而是xib文件相應touch down事件。這種方法，缺點就是沒有xib就悲劇了。
.h
- (IBAction)dimissKeyboard:(id)sender;
.m
- (IBAction)dimissKeyboard:(id)sender {
[text resignFirstResponder];
}
23、Gif圖片的解析
01
//加載gif
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NSString *filePath = [[NSBundle mainBundle]pathForResource:@"bai3" ofType:@"gif"];
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NSData *data = [NSData dataWithContentsOfFile:filePath];
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CGImageSourceRef gif = CGImageSourceCreateWithData((CFDataRef)data, nil);
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//獲取gif的各種屬性
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CFDictionaryRef gifprops =(CGImageSourceCopyPropertiesAtIndex(gif,0,NULL));
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NSLog(@"_______%@",gifprops);
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NSInteger count =CGImageSourceGetCount(gif);
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NSLog(@"________%d",count);
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CFDictionaryRef gifDic = CFDictionaryGetValue(gifprops, kCGImagePropertyGIFDictionary);
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CFDictionaryRef delay = CFDictionaryGetValue(gifDic, kCGImagePropertyGIFDelayTime);
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NSLog(@"_______%@",delay);
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//[gifDic objectForKey:(NSString *)kCGImagePropertyGIFDelayTime];
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// NSNumber * w = CFDictionaryGetValue(gifprops, @"PixelWidth");
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// NSNumber * h =CFDictionaryGetValue(gifprops, @"PixelHeight");
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// float totalDuration = delay.doubleValue * count;
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// float pixelWidth = w.intValue;
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// float pixelHeight = h.intValue;
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//將gif解析成UIImage類型對象，並加進images數組中
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NSMutableArray *images = [NSMutableArray arrayWithCapacity:count];
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for(int index=0;index<count;index++)
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{
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CGImageRef ref = CGImageSourceCreateImageAtIndex(gif, index, nil);
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UIImage *img = [UIImage imageWithCGImage:ref];
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[images addObject:img];
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CFRelease(ref);
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}
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CFRelease(gifprops);
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CFRelease(gif);
Gif的合成
01
- (void)exportAnimatedGif:(CGImageSourceRef )gif :(NSMutableArray *)images
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{
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NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"animated.gif"];
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CGImageDestinationRef destination = CGImageDestinationCreateWithURL(( CFURLRef)[NSURL fileURLWithPath:path],
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kUTTypeGIF,
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images.count,
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NULL);
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UIImage *image;
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for (int i = 0; i<images.count; i++)
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{
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image = images[i];
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CFDictionaryRef gifprops =(CGImageSourceCopyPropertiesAtIndex(gif,i,NULL));
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CFDictionaryRef gifDic = CFDictionaryGetValue(gifprops, kCGImagePropertyGIFDictionary);
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NSNumber *delay = CFDictionaryGetValue(gifDic, kCGImagePropertyGIFDelayTime);
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NSDictionary *gifDelay = [NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:delay forKey:(NSString *)kCGImagePropertyGIFDelayTime]
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forKey:(NSString *)kCGImagePropertyGIFDictionary];
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CGImageDestinationAddImage(destination,image.CGImage, (CFDictionaryRef)gifDelay);
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CGImageDestinationSetProperties(destination, ( CFDictionaryRef)gifprops);
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}
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// CGImageDestinationSetProperties(destination, ( CFDictionaryRef)gifprops);
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CGImageDestinationFinalize(destination);
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CFRelease(destination);
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NSLog(@"animated GIF file created at %@", path);
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} 24.將一個UIView對象的內容保存為UIImage
01
+ (UIImage*)imageFromView:(UIView*)view{
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UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, view.layer.contentsScale);
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[view.layer renderInContext:UIGraphicsGetCurrentContext()];
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UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return image;
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}注意：生成的圖片的scale和view的scale一致，這樣才可以保證圖片的效果和view顯示的完全一致，使用renderInContext方法可以讓subviews的內容也顯示的圖片裡。
