小编mil*_*hal的帖子

更新iTunes签名协议页面中的地址时出现以下错误.

The address entered appears to be invalid. Please correct your address and resubmit.

有人可以帮我解决这个错误吗？

我想了解Java double类型如何在Java 中将其值存储在内存中.当我运行以下代码时,我得到意外的输出:

public static void main(String[] args)  {

    float a = 1.5f;
    float b= 0.5f;
    double c= 1.5;
    double d = 0.5;

    float a1 = 1.4f;
    float b1= 0.5f;
    double c1= 1.4;
    double d1 = 0.5;

    System.out.println(" a- b is " + (a-b));
    System.out.println(" c- d is " + (c-d));
    System.out.println("a1-b1 is " + (a1-b1));
    System.out.println("c1-d1 is " + (c1-d1));

}

输出:

 a- b is 1.0
 c- d is 1.0
a1-b1 is 0.9
c1-d1 is 0.8999999999999999

为什么c1-d1 …

我使用AES加密字符串,但加密的字符串包含\n和\r结尾.

 public class AESImpl {

  private static String decryptedString;

  private static String encryptedString;

  public static void main(String[] args) throws NoSuchAlgorithmException, IOException,  ClassNotFoundException {

    String strToEncrypt = "This text has to be encrypted";
    SecretKey secretKey = generateSecretKey();
    String encryptStr = encrypt(strToEncrypt, secretKey);
    System.out.println("Encrypted String : " + encryptStr + "It should not come in new line");
    String decryptStr = decrypt(encryptStr, secretKey);
    System.out.println("Decrypted String : " + decryptStr);
  }

  private static SecretKey generateSecretKey() throws NoSuchAlgorithmException, IOException {
    KeyGenerator …

我可以UINavigationController通过覆盖drawRect:方法来改变背景图像:

@implementation UINavigationBar (UINavigationBarCategory)

- (void)drawRect:(CGRect)rect {

    UIImage *img  = [UIImage imageNamed: @"navController.png"];
    [img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
        self.tintColor = [UIColor blueColor];
}

@end

背景是我打算成为的tintColor,也是如此,但是当尝试设置UIColor类中不存在的颜色时,它会失败并显示奇怪的颜色:

@implementation UINavigationBar (UINavigationBarCategory)

- (void)drawRect:(CGRect)rect {

    UIImage *img  = [UIImage imageNamed: @"navController.png"];
    [img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
        self.tintColor = [UIColor colorWithRed:(26/255) green:(103/255) blue:(159/255)                      alpha:1];
}

@end

我怎么强迫UINavigationBar显示我想要的颜色？

注意:我只对导航控制器按钮颜色有问题,因为背景本身设置为图像.

我正在使用Xcode 8.0.在那我的运行按钮变成分析按钮.如何将其更改回运行按钮？

屏幕拍摄.