iOS 17个常用代码整理

1.  
2.  
3. *)email  
4.  
5.    NSString *emailRegex= @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";  
6.    NSPredicate *emailTest= [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex];  
7.    return [emailTest evaluateWithObject:email];  
8.  
9.  
10. *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)];  
11.  
12. (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize  
13.  
14.    // Create a graphics image context  
15.    UIGraphicsBeginImageContext(newSize);  
16.    // Tell the old image to draw in this newcontext, with the desired  
17.    // new size  
18.    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];  
19.    // Get the new image from the context  
20.    UIImage* newImage= UIGraphicsGetImageFromCurrentImageContext();  
21.    // End the context  
22.    UIGraphicsEndImageContext();  
23.    // Return the new image.  
24.    return newImage;  
25.  
26.  
27. (IBAction)uploadButton:(id)sender {  
28.    UIImage *image= [UIImage imageNamed:@"1.jpg"]; //图片名  
29.    NSData *imageData= UIImageJPEGRepresentation(image,0.5);//压缩比例  
30.    NSLog(@"字节数:%i",[imageData length]);  
31.    // post url  
32.    NSString *urlString= @"http://192.168.1.113:8090/text/UploadServlet";  
33.    //服务器地址  
34.    // setting up the request object now  
35.    NSMutableURLRequest *request= [[NSMutableURLRequest alloc] init] ;  
36.    [request setURL:[NSURL URLWithString:urlString]];  
37.    [request setHTTPMethod:@"POST"];  
38.    //  
39.    NSString *boundary= [NSString stringWithString:@"---------------------------14737809831466499882746641449"];  
40.    NSString *contentType= [NSString stringWithFormat:@"multipart/form-data;boundary=%@",boundary];  
41.    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];  
42.    //  
43.    NSMutableData *body= [NSMutableData data];  
44.    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];  
45.    [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  
46.    [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];  
47.    [body appendData:[NSData dataWithData:imageData]];  
48.    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];  
49.    [request setHTTPBody:body];  
50.    // NSLog(@"1-body:%@",body);  
51.    NSLog(@"2-request:%@",request);  
52.    NSData *returnData= [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];  
53.    NSString *returnString= [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];  
54.    NSLog(@"3-测试输出：%@",returnString);  
55.    15.给imageView加载图片  
56.    UIImage *myImage= [UIImage imageNamed:@"1.jpg"];  
57.    [imageView setImage:myImage];  
58.    [self.view addSubview:imageView];  
59.    16.对图库的操作  
60.    选择相册：  
61.    UIImagePickerControllerSourceTypesourceType=UIImagePickerControllerSourceTypeCamera;  
62.    if (![UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {  
63.        sourceType=UIImagePickerControllerSourceTypePhotoLibrary;  
64.    }  
65.    UIImagePickerController * picker= [[UIImagePickerControlleralloc]init];  
66.    picker.delegate= self;  
67.    picker.allowsEditing=YES;  
68.    picker.sourceType=sourceType;  
69.    [self presentModalViewController:picker animated:YES];  
70.    选择完毕：  
71.    -(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info  
72.    {  
73.        [picker dismissModalViewControllerAnimated:YES];  
74.        UIImage * image=[info objectForKey:UIImagePickerControllerEditedImage];  
75.        [self performSelector:@selector(selectPic:) withObject:imageafterDelay:0.1];  
76.    }  
77.    -(void)selectPic:(UIImage*)image  
78.    {  
79.        NSLog(@"image%@",image);  
80.        imageView= [[UIImageView alloc] initWithImage:image];  
81.        imageView.frame= CGRectMake(0, 0, image.size.width, image.size.height);  
82.        [self.viewaddSubview:imageView];  
83.        [self performSelectorInBackground:@selector(detect:) withObject:nil];  
84.    }  
85.    detect为自己定义的方法，编辑选取照片后要实现的效果  
86.    取消选择：  
87.    -(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker  
88.    {  
89.        [picker dismissModalViewControllerAnimated:YES];  
90.    }  
91.    17.跳到下个View  
92.    nextWebView= [[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil];  
93.    [self presentModalViewController:nextWebView animated:YES];  
94.      
95.      
96.    //创建一个UIBarButtonItem右边按钮  
97.    UIBarButtonItem *rightButton= [[UIBarButtonItem alloc] initWithTitle:@"右边" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];  
98.    [self.navigationItem setRightBarButtonItem:rightButton];  
99.    设置navigationBar隐藏  
100.    self.navigationController.navigationBarHidden= YES;//  
101.    iOS开发之UIlabel多行文字自动换行 （自动折行）  
102.    UIView *footerView= [[UIView alloc]initWithFrame:CGRectMake(10, 100, 300, 180)];  
103.    UILabel *label= [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 300, 150)];  
104.    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!";  
105.    //背景颜色为红色  
106.    label.backgroundColor= [UIColor redColor];  
107.    //设置字体颜色为白色  
108.    label.textColor= [UIColor whiteColor];  
109.    //文字居中显示  
110.    label.textAlignment= UITextAlignmentCenter;  
111.    //自动折行设置  
112.    label.lineBreakMode= UILineBreakModeWordWrap;  
113.    label.numberOfLines= 0;  
114.    30.代码生成button  
115.    CGRect frame= CGRectMake(0, 400, 72.0, 37.0);  
116.    UIButton *button= [UIButton buttonWithType:UIButtonTypeRoundedRect];  
117.    button.frame= frame;  
118.    [button setTitle:@"新添加的按钮" forState: UIControlStateNormal];  
119.    button.backgroundColor= [UIColor clearColor];  
120.    button.tag= 2000;  
121.    [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];  
122.    [self.view addSubview:button];  
123.    31.让某个控件在View的中心位置显示：  
124.    （某个控件，比如label，View）label.center= self.view.center;  
125.    32.好看的文字处理  
126.    以tableView中cell的textLabel为例子：  
127.    cell.backgroundColor= [UIColorscrollViewTexturedBackgroundColor];  
128.    //设置文字的字体  
129.    cell.textLabel.font= [UIFont fontWithName:@"AmericanTypewriter" size:100.0f];  
130.    //设置文字的颜色  
131.    cell.textLabel.textColor= [UIColor orangeColor];  
132.    //设置文字的背景颜色  
133.    cell.textLabel.shadowColor= [UIColor whiteColor];  
134.    //设置文字的显示位置  
135.    cell.textLabel.textAlignment= UITextAlignmentCenter;  
136.    33. ———————-隐藏Status Bar—————————–  
137.    读者可能知道一个简易的方法,那就是在程序的viewDidLoad中加入  
138.    [[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO];  
139.    33. 更改AlertView背景  
140.      
141.    UIAlertView *theAlert= [[[UIAlertViewalloc] initWithTitle:@"Atention"  
142.                                                       message: @"I'm a Chinese!"  
143.                                                      delegate:nil  
144.                                             cancelButtonTitle:@"Cancel"  
145.                                             otherButtonTitles:@"Okay",nil] autorelease];  
146.    [theAlert show];  
147.    UIImage *theImage= [UIImageimageNamed:@"loveChina.png"];  
148.    theImage= [theImage stretchableImageWithLeftCapWidth:0topCapHeight:0];  
149.    CGSize theSize= [theAlert frame].size;  
150.    UIGraphicsBeginImageContext(theSize);  
151.    [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。  
152.    theImage= UIGraphicsGetImageFromCurrentImageContext();  
153.    UIGraphicsEndImageContext();  
154.    theAlert.layer.contents= (id)[theImage CGImage];  
155.    34. 键盘透明  
156.    textField.keyboardAppearance= UIKeyboardAppearanceAlert;  
157.      
158.    状态栏的网络活动风火轮是否旋转  
159.    [UIApplication sharedApplication].networkActivityIndicatorVisible，默认值是NO。  
160.      
161.    35截取屏幕图片  
162.    //创建一个基于位图的图形上下文并指定大小为CGSizeMake(200,400)  
163.    UIGraphicsBeginImageContext(CGSizeMake(200,400));  
164.      
165.    //renderInContext 呈现接受者及其子范围到指定的上下文  
166.    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];  
167.    //返回一个基于当前图形上下文的图片  
168.    UIImage *aImage= UIGraphicsGetImageFromCurrentImageContext();  
169.    //移除栈顶的基于当前位图的图形上下文  
170.    UIGraphicsEndImageContext();  
171.    //以png格式返回指定图片的数据  
172.    imageData= UIImagePNGRepresentation(aImage);  
173.    36更改cell选中的背景  
174.    UIView *myview= [[UIView alloc] init];  
175.    myview.frame= CGRectMake(0, 0, 320, 47);  
176.    myview.backgroundColor= [UIColorcolorWithPatternImage:[UIImage imageNamed:@"0006.png"]];  
177.    cell.selectedBackgroundView= myview;  
178.    37显示图像:  
179.    CGRect myImageRect= CGRectMake(0.0f, 0.0f, 320.0f, 109.0f);  
180.    UIImageView *myImage= [[UIImageView alloc] initWithFrame:myImageRect];  
181.    [myImage setImage:[UIImage imageNamed:@"myImage.png"]];  
182.    myImage.opaque= YES; //opaque是否透明  
183.    [self.view addSubview:myImage];  
184.    38.能让图片适应框的大小（没有确认）  
185.    NSString*imagePath= [[NSBundle mainBundle] pathForResource:@"XcodeCrash"ofType:@"png"];  
186.    UIImage *image= [[UIImage alloc]initWithContentsOfFile:imagePath];  
187.    UIImage *newImage= [image transformWidth:80.f height:240.f];  
188.    UIImageView *imageView= [[UIImageView alloc]initWithImage:newImage];  
189.    [newImagerelease];  
190.    [image release];  
191.    [self.view addSubview:imageView];  
192.    39.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！  
193.    UIButton *imgButton=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 120, 120)];  
194.    [imgButton setBackgroundImage:(UIImage *)[self.imgArray objectAtIndex:indexPath.row] forState:UIControlStateNormal];  
195.    imgButton.tag=[indexPath row];  
196.    [imgButton addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];  
197.  也可以使用UIView上的Tap点击事件
198. self action:@selector(handleSingleTap:)];
   [self.headImage addGestureRecognizer:singleTap];