1.判断邮箱格式是否正确的代码：
//利用正则表达式验证
-(BOOL)isValidateEmail:(NSString *)email
{
NSString *emailRegex
= @"[A-Z0-9a-z._%+-][email protected][A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF
MATCHES%@",emailRegex];
return [emailTest evaluateWithObject:email];
}
2.图片压缩
用法：UIImage *yourImage= [self imageWithImageSimple:image
scaledToSize:CGSizeMake(210.0, 210.0)];
//压缩图片
- (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.亲测可用的图片上传代码
- (IBAction)uploadButton:(id)sender {
UIImage *image = [UIImage imageNamed:@"1.jpg"]; //图片名
NSData *imageData
= UIImageJPEGRepresentation(image,0.5);//压缩比例
NSLog(@"字节数:%i",[imageData length]);
// post url
NSString *urlString
= @"http://192.168.1.113:8090/text/UploadServlet";
//服务器地址
// 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]];
//上传上去的图片名字
[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-测试输出：%@",returnString);
4.给imageView加载图片
UIImage *myImage = [UIImage imageNamed:@"1.jpg"];
[imageView setImage:myImage];
[self.view addSubview:imageView];
5.对图库的操作
选择相册：
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];
选择完毕：
-(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为自己定义的方法，编辑选取照片后要实现的效果
取消选择：
-(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker
{
[picker dismissModalViewControllerAnimated:YES];
}
6.跳到下个View
nextWebView =
[[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil];
[self presentModalViewController:nextWebView animated:YES];
7.创建一个UIBarButton右边按钮
UIBarButtonItem *rightButton =
[[UIBarButtonItem alloc] initWithTitle:@"右边" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];
[self.navigationItem setRightBarButtonItem:rightButton];
8.设置navigationBar隐藏
self.navigationController.navigationBarHidden = YES;//
9.UIlabel多行文字自动换行 （自动折行）
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!";
//背景颜色为红色
label.backgroundColor = [UIColor redColor];
//设置字体颜色为白色
label.textColor = [UIColor whiteColor];
//文字居中显示
label.textAlignment = UITextAlignmentCenter;
//自动折行设置
label.lineBreakMode = UILineBreakModeWordWrap;
label.numberOfLines = 0;
10.代码生成Button
CGRect frame
= CGRectMake(0, 400, 72.0, 37.0);
UIButton *button =
[UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = frame;
[button setTitle:@"新添加的按钮" forState: UIControlStateNormal];
button.backgroundColor = [UIColor clearColor];
button.tag = 2000;
[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
11.让某个控件在View的中心位置显示：
（某个控件，比如label，View）label.center = self.view.center；
12.自定义text各种效果：
cell.backgroundColor =
[UIColorscrollViewTexturedBackgroundColor];
//设置文字的字体
cell.textLabel.font
= [UIFont
fontWithName:@"AmericanTypewriter" size:100.0f];
//设置文字的颜色
cell.textLabel.textColor
= [UIColor orangeColor];
//设置文字的背景颜色
cell.textLabel.shadowColor = [UIColor
whiteColor];
//设置文字的显示位置
cell.textLabel.textAlignment =
UITextAlignmentCenter;
13.隐藏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)];//这个地方的大小要自己调整，以适应alertview的背景颜色的大小。
theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
theAlert.layer.contents =
(id)[theImage CGImage];
15.键盘透明：
textField.keyboardAppearance =
UIKeyboardAppearanceAlert;
16.状态栏的网络活动风火轮是否旋转：
[UIApplication
sharedApplication].networkActivityIndicatorVisible，默认值是NO。
17.截取屏幕图片：
//创建一个基于位图的图形上下文并指定大小为CGSizeMake(200,400)
UIGraphicsBeginImageContext(CGSizeMake(200,400));
//renderInContext 呈现接受者及其子范围到指定的上下文
[self.view.layer
renderInContext:UIGraphicsGetCurrentContext()];
//返回一个基于当前图形上下文的图片
UIImage
*aImage =
UIGraphicsGetImageFromCurrentImageContext();
//移除栈顶的基于当前位图的图形上下文
UIGraphicsEndImageContext();
//以png格式返回指定图片的数据
imageData
= UIImagePNGRepresentation(aImage);
18.更改cell选中的背景：
UIView *myview = [[UIView alloc]
init];
myview.frame = CGRectMake(0, 0, 320,
47);
myview.backgroundColor =
[UIColorcolorWithPatternImage:[UIImage
imageNamed:@"0006.png"]];
cell.selectedBackgroundView =
myview;:
19.显示图片：
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.能让图片适应框的大小（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.实现点击图片进行跳转的代码：（生成一个带有背景图片的button，给button绑定想要的事件）
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.键盘回收：
-（IBAction）textFieldDoneEditing：（id）sender{
[sender resighFirstRespond]；
}
通过点击背景回收键盘：（两个都得添加）
-（IBAction）textFieldDoneEditing：（id）sender{
[sender resighFirstRespond]；
}
-（IBAction）backgroundTapped：（id）sender{
[nameField resignFirstRespond];
[numberField resignFirstRespond];
}