常见比较实用的代码

来源：互联网发布：淘宝网商城汽车配件编辑：程序博客网时间：2024/05/29 04:31

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._%+-]+@[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.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];

}

5.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;

6.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;

7. ———————-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];

8. 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];

9. 键盘透明
textField.keyboardAppearance = UIKeyboardAppearanceAlert;

10.状态栏的网络活动风火轮是否旋转
[UIApplication sharedApplication].networkActivityIndicatorVisible，默认值是NO。

11.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);

12.身份证号码判断

-(BOOL)isCrediCard:(NSString *)IDNumb

{

//判断位数

if ([IDNumblength] !=15 && [IDNumblength] !=18)

{

returnNO;

}

NSString *carid = IDNumb;

long lSumQT =0;

//加权因子

int R[] ={7,9,10,5,8,4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };

//校验码

unsigned char sChecker[11]={'1','0','X','9','8','7','6','5','4','3','2'};

//将15位身份证号转换成18位

NSMutableString *mString = [NSMutableStringstringWithString:IDNumb];

if ([IDNumblength] ==15)

{

[mString insertString:@"19"atIndex:6];

long p =0;

const char *pid = [mString UTF8String];

for (int i=0; i<=16; i++)

{

p += (pid[i]-48) * R[i];

}

int o = p%11;

NSString *string_content = [NSStringstringWithFormat:@"%c",sChecker[o]];

[mString insertString:string_contentatIndex:[mStringlength]];

carid = mString;

}

//判断地区码

NSString * sProvince = [caridsubstringToIndex:2];

if (![selfareaCode:sProvince])

{

returnNO;

}

//判断年月日是否有效

//年份

int strYear = [[selfgetStringWithRange:caridValue1:6Value2:4]intValue];

//月份

int strMonth = [[selfgetStringWithRange:caridValue1:10Value2:2]intValue];

//日

int strDay = [[selfgetStringWithRange:caridValue1:12Value2:2]intValue];

NSTimeZone *localZone = [NSTimeZonelocalTimeZone];

NSDateFormatter *dateFormatter = [[NSDateFormatteralloc]init];

[dateFormatter setDateStyle:NSDateFormatterMediumStyle];

[dateFormatter setTimeStyle:NSDateFormatterNoStyle];

[dateFormatter setTimeZone:localZone];

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *date=[dateFormatterdateFromString:[NSStringstringWithFormat:@"%d-%d-%d 12:01:01",strYear,strMonth,strDay]];

if (date ==nil)

{

returnNO;

}

const char *PaperId = [carid UTF8String];

//检验长度

if( 18 != strlen(PaperId)) return -1;

//校验数字

for (int i=0; i<18; i++)

{

if ( !isdigit(PaperId[i]) && !(('X' == PaperId[i] ||'x' == PaperId[i]) &&17 == i) )

{

returnNO;

}

//验证最末的校验码

for (int i=0; i<=16; i++)

{

lSumQT += (PaperId[i]-48) * R[i];

}

if (sChecker[lSumQT%11] != PaperId[17] )

{

returnNO;

}

returnYES;

}

-(BOOL)areaCode:(NSString *)code

{

NSMutableDictionary *dic = [[NSMutableDictionaryalloc]init];

[dic setObject:@"北京"forKey:@"11"];

[dic setObject:@"天津"forKey:@"12"];

[dic setObject:@"河北"forKey:@"13"];

[dic setObject:@"山西"forKey:@"14"];

[dic setObject:@"内蒙古" forKey:@"15"];

[dic setObject:@"辽宁"forKey:@"21"];

[dic setObject:@"吉林"forKey:@"22"];

[dic setObject:@"黑龙江" forKey:@"23"];

[dic setObject:@"上海"forKey:@"31"];

[dic setObject:@"江苏"forKey:@"32"];

[dic setObject:@"浙江"forKey:@"33"];

[dic setObject:@"安徽"forKey:@"34"];

[dic setObject:@"福建"forKey:@"35"];

[dic setObject:@"江西"forKey:@"36"];

[dic setObject:@"山东"forKey:@"37"];

[dic setObject:@"河南"forKey:@"41"];

[dic setObject:@"湖北"forKey:@"42"];

[dic setObject:@"湖南"forKey:@"43"];

[dic setObject:@"广东"forKey:@"44"];

[dic setObject:@"广西"forKey:@"45"];

[dic setObject:@"海南"forKey:@"46"];

[dic setObject:@"重庆"forKey:@"50"];

[dic setObject:@"四川"forKey:@"51"];

[dic setObject:@"贵州"forKey:@"52"];

[dic setObject:@"云南"forKey:@"53"];

[dic setObject:@"西藏"forKey:@"54"];

[dic setObject:@"陕西"forKey:@"61"];

[dic setObject:@"甘肃"forKey:@"62"];

[dic setObject:@"青海"forKey:@"63"];

[dic setObject:@"宁夏"forKey:@"64"];

[dic setObject:@"新疆"forKey:@"65"];

[dic setObject:@"台湾"forKey:@"71"];

[dic setObject:@"香港"forKey:@"81"];

[dic setObject:@"澳门"forKey:@"82"];

[dic setObject:@"国外"forKey:@"91"];

if ([dic objectForKey:code] == nil)

{

returnNO;

}

returnYES;

}

-(NSString *)getStringWithRange:(NSString *)str Value1:(NSInteger )value1 Value2:(NSInteger )value2;

{

return [strsubstringWithRange:NSMakeRange(value1,value2)];

}

13.正则判断手机号码地址格式

+(BOOL)isMobileNumber:(NSString *)mobileNum

{

/**

* 手机号码

* 移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188

* 联通：130,131,132,152,155,156,185,186

* 电信：133,1349,153,180,189

NSString * MOBILE =@"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";

/**

10 * 中国移动：China Mobile

11 * 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188

12 */

NSString * CM =@"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";

/**

15 * 中国联通：China Unicom

16 * 130,131,132,152,155,156,185,186

17 */

NSString * CU =@"^1(3[0-2]|5[256]|8[56])\\d{8}$";

/**

20 * 中国电信：China Telecom

21 * 133,1349,153,180,189

22 */

NSString * CT =@"^1((33|53|8[09])[0-9]|349)\\d{7}$";

/**

25 * 大陆地区固话及小灵通

26 * 区号：010,020,021,022,023,024,025,027,028,029

27 * 号码：七位或八位

28 */

// NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";

NSPredicate *regextestmobile = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", MOBILE];

NSPredicate *regextestcm = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", CM];

NSPredicate *regextestcu = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", CU];

NSPredicate *regextestct = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", CT];

if (([regextestmobileevaluateWithObject:mobileNum] ==YES)

|| ([regextestcm evaluateWithObject:mobileNum] == YES)

|| ([regextestct evaluateWithObject:mobileNum] == YES)

|| ([regextestcu evaluateWithObject:mobileNum] == YES))

{

returnYES;

}

else

{

returnNO;

}

14.判断是否是纯数字

+ (BOOL)isNumText:(NSString *)str{

NSString * regex =@"(/^[0-9]*$/)";

NSPredicate * pred = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", regex];

BOOL isMatch = [predevaluateWithObject:str];

if (isMatch) {

returnYES;

}else{

returnNO;

}

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