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1、.iOS开发中最有用关键的代码合集本文整理了，在iOS开发中我们所遇到一些开发问题的技巧类的代码，让你在开发过程中避免了很多弯路，希望能给你的开发带来帮助和启发。1.判断格式是否正确的代码：1. /利用正则表达式验证-(BOOL)isValidateEmail:(NSString*)email2. 3. NSString*emailRegex=A-Z0-9a-z._%+-+A-Za-z0-9.-+.A-Za-z2,4;4. NSPredicate*emailTest=NSPredicatepredicateWithFormat:SELFMATCHES%,emailRegex;5. return
2、emailTestevaluateWithObject:email;6. 2.图片压缩1. 用法：UIImage*yourImage=selfimageWithImageSimple:imagescaledToSize:CGSizeMake(210.0,210.0);/压缩图片-(UIImage*)imageWithImageSimple:(UIImage*)imagescaledToSize:(CGSize)newSize2. 3. /CreateagraphicsimagecontextUIGraphicsBeginImageContext(newSize);4. /Telltheoldi
3、magetodrawinthisnewcontext,withthedesired/newsizeimagedrawInRect:CGRectMake(0,0,newSize.width,newSize.height);5. /GetthenewimagefromthecontextUIImage*newImage=UIGraphicsGetImageFromCurrentImageContext();6. /EndthecontextUIGraphicsEndImageContext();7. /Returnthenewimage.returnnewImage;8. 3.亲测可用的图片上传代
4、码1. -(IBAction)uploadButton:(id)sender2. UIImage*image=UIImageimageNamed:1.jpg;/图片名NSData*imageData=UIImageJPEGRepresentation(image,0.5);/压缩比例NSLog(字节数:%i,imageDatalength);3. /posturlNSString*urlString=192.168.1.113:8090/text/UploadServlet;4. /服务器地址/settinguptherequestobjectnowNSMutableURLRequest*re
5、quest=NSMutableURLRequestallocinit;5. requestsetURL:NSURLURLWithString:urlString;6. requestsetHTTPMethod:POST;7. /NSString*boundary=NSStringstringWithString:-9;8. NSString*contentType=NSStringstringWithFormat:multipart/form-data;boundary=%,boundary;9. requestaddValue:contentTypeforHTTPHeaderField:Co
6、ntent-Type;10. /NSMutableData*body=NSMutableDatadata;11. bodyappendData:NSStringstringWithFormat:rn-%rn,boundarydataUsingEncoding:NSUTF8StringEncoding;12. bodyappendData:NSStringstringWithString:Content-Disposition:form-data;name=userfile;filename=2.pngrndataUsingEncoding:NSUTF8StringEncoding;/上传上去的
7、图片名字bodyappendData:NSStringstringWithString:Content-Type:application/octet-streamrnrndataUsingEncoding:NSUTF8StringEncoding;13. bodyappendData:NSDatadataWithData:imageData;14. bodyappendData:NSStringstringWithFormat:rn-%-rn,boundarydataUsingEncoding:NSUTF8StringEncoding;15. requestsetHTTPBody:body;1
8、6. /NSLog(1-body:%,body);NSLog(2-request:%,request);17. NSData*returnData=NSURLConnectionsendSynchronousRequest:requestreturningResponse:nilerror:nil;18. NSString*returnString=NSStringallocinitWithData:returnDataencoding:NSUTF8StringEncoding;19. NSLog(3-测试输出：%,returnString);4.给imageView加载图片1. UIImag
9、e*myImage=UIImageimageNamed:1.jpg;2. imageViewsetImage:myImage;3. self.viewaddSubview:imageView;5.对图库的操作1. 选择相册：UIImagePickerControllerSourceTypesourceType=UIImagePickerControllerSourceTypeCamera;2. if(!UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera)3. sourceTyp
10、e=UIImagePickerControllerSourceTypePhotoLibrary;4. 5. UIImagePickerController*picker=UIImagePickerControllerallocinit;6. picker.delegate=self;7. picker.allowsEditing=YES;8. picker.sourceType=sourceType;9. selfpresentModalViewController:pickeranimated:YES;10. 选择完毕：-(void)imagePickerController:(UIImag
11、ePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary*)info11. 12. pickerdismissModalViewControllerAnimated:YES;13. UIImage*image=infoobjectForKey:UIImagePickerControllerEditedImage;14. selfperformSelector:selector(selectPic:)withObject:imageafterDelay:0.1;15. 16. -(void)selectPic:(UI
12、Image*)image17. 18. NSLog(image%,image);19. imageView=UIImageViewallocinitWithImage:image;20. imageView.frame=CGRectMake(0,0,image.size.width,image.size.height);21. self.viewaddSubview:imageView;22. selfperformSelectorInBackground:selector(detect:)withObject:nil;23. 24. detect为自己定义的方法，编辑选取照片后要实现的效果取
13、消选择：-(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker25. 26. pickerdismissModalViewControllerAnimated:YES;27. 6.跳到下个View1. nextWebView=WEBViewControllerallocinitWithNibName:WEBViewControllerbundle:nil;2. selfpresentModalViewController:nextWebViewanimated:YES;7.创建一个UIBarButton右边按钮1. UIBarButtonItem*rightButton=UIBarButtonItemallocinitWithTitle:右边style:
