12.
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._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"
;
NSPredicate
*emailTest = [
NSPredicate
predicateWithFormat
:
@"SELF MATCHES%@"
,emailRegex];
return
[emailTest
evaluateWithObject
:email];
}
13.
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;
}
14.
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);
15.
给
imageView
加载图片
UIImage
*myImage = [
UIImage
imageNamed
:
@"1.jpg"
];
[
imageView
setImage
:myImage];
[
self
.
view
addSubview
:
imageView
];
16.
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];
}
17.
跳到下个
View
nextWebView
= [[
WEBViewController
alloc
]
initWithNibName
:
@"WEBViewController"
bundle
:
nil
];
[
self
presentModalViewController
:
nextWebView
animated
:
YES
];
//
创建一个
UIBarButtonItem
右边按钮
UIBarButtonItem
*rightButton = [[
UIBarButtonItem
alloc
]
initWithTitle
:
@"
右边
"
style
:
UIBarButtonItemStyleDone
target
:
self
action
:
@selector
(clickRightButton)];
[
self
.
navigationItem
setRightBarButtonItem
:rightButton];
设置
navigationBar
隐藏
self
.
navigationController
.
navigationBarHidden
=
YES
;//
iOS开发之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;
30.
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];
31.
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
;
32.
好看的文字处理
以
tableView
中
cell
的
textLabel
为例子:
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;
33.
———————-隐藏Status Bar—————————–
读者可能知道一个简易的方法,
那就是在程序的viewDidLoad
中加入
[[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO];
33. 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];
34.
键盘透明
textField.keyboardAppearance = UIKeyboardAppearanceAlert;
状态栏的网络活动风火轮是否旋转
[UIApplication sharedApplication].networkActivityIndicatorVisible
,
默认值是
NO
。
35
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 = UIImagePNGR
epresentation(aImage);
36
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;
37
显示
图像:
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];
38.
能让图片适应框的大小(没有确认)
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];
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!
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
];