移动开发--iOS开发小代码总结

来源：互联网发布：数据统计分析的目的编辑：程序博客网时间：2024/06/08 13:11

看到CSDN博客频道有一个《iOS游戏编程之旅》征文活动挺好的，主要是喜欢签名书籍哈。所以把iOS开发的小代码总结拿出来分享下。

1.测试后可以用的图片上传代码

- (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);}

2、图片的压缩用法：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、给imageView加载图片

UIImage *myImage = [UIImage imageNamed:@"1.jpg"];[imageView setImage:myImage];[self.view addSubview:imageView];

4、如何设置navigationBar隐藏

self.navigationController.navigationBarHidden = YES;//

5、UIlabel多行文字自动换行（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;

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