2024年4月26日发(作者：)

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%@",emailRe

gex];

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,,)];

// 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:@""]; //图片名

NSData *imageData = UIImageJPEGRepresentation(image,0.5);//压缩比例

NSLog(@"字节数:%i",[imageData length]);

// post url

NSString *urlString = @"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:@"---------------------------147378

82746641449"];

NSString *contentType = [NSString stringWithFormat:@"multipart/form-data;boundary=%@",bou

ndary];

[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

//

NSMutableData *body = [NSMutableData data];

[body appendData:[[NSString stringWithFormat:@"rn--%@rn",boundary] dataUsingEncoding:N

SUTF8StringEncoding]];

[body appendData:[[NSString stringWithString:@"Content-Disposition:form-data; name="userfile

"; filename=""rn"] dataUsingEncoding:NSUTF8StringEncoding]]; //上传上去的图片名字

[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-streamrnrn"]

dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[NSData dataWithData:imageData]];

[body appendData:[[NSString stringWithFormat:@"rn--%@--rn",boundary] dataUsingEncoding:

NSUTF8StringEncoding]];

[request setHTTPBody:body];