ios总结

延迟执行:

########################################################################################

 // 创建延期的时间 2S，因为dispatch_time使用的时间是纳秒，尼玛，比毫秒还小，太夸张了！！！

　　double delayInSeconds = 0;

    dispatch_time_t delayInNanoSeconds = dispatch_time(DISPATCH_TIME_NOW, (int64_t) (delayInSeconds * NSEC_PER_SEC));

    // 延期执行    dispatch_after(delayInNanoSeconds, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {

　　。。。。       

    });

 #####################################################################################

 

退出键盘(取消view上的所有响应者):

 #####################################################################################

 [self.view endEditing:YES];

 

 

本地存储:

 #####################################################################################

- (void)updateUserInUserDefaults{

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

        [userDefaults setObject:passWord forKey:@"password"];    [userDefaults synchronize];

}

 

账号和密码框:

    // 生成账号输入框
    _loginNameField = [[UITextField alloc] init];
    [_loginNameField setX:loginInputView.frame.origin.x + 50];
    [_loginNameField setY:loginInputView.frame.origin.y];
    [_loginNameField setWidth:loginInputView.frame.size.width - 50];
    [_loginNameField setHeight:loginInputView.frame.size.height / 2];
    _loginNameField.backgroundColor = [UIColor clearColor];
    _loginNameField.placeholder = @"请输入账号名";
    _loginNameField.borderStyle = UITextBorderStyleNone;
    _loginNameField.font = [UIFont systemFontOfSize:15];
    _loginNameField.textColor = HexGRAY(0x11, 255);
    _loginNameField.keyboardType = UIKeyboardTypeDefault;
    _loginNameField.returnKeyType = UIReturnKeyDefault;
    _loginNameField.clearButtonMode = UITextFieldViewModeWhileEditing;
    [self.view addSubview:_loginNameField];
    
    // 生成密码输入框
    _passwordField = [[UITextField alloc] init];
    [_passwordField setX:loginInputView.frame.origin.x + 50];
    [_passwordField setY:loginInputView.frame.origin.y + loginInputView.frame.size.height / 2];
    [_passwordField setWidth:loginInputView.frame.size.width - 50];
    [_passwordField setHeight:loginInputView.frame.size.height / 2];
    _passwordField.backgroundColor = [UIColor clearColor];
    _passwordField.placeholder = @"请输入密码";
    _passwordField.borderStyle = UITextBorderStyleNone;
    _passwordField.font = [UIFont systemFontOfSize:15];
    _passwordField.textColor = HexGRAY(0x11, 255);
    _passwordField.keyboardType = UIKeyboardTypeDefault;
    _passwordField.returnKeyType = UIReturnKeyDefault;
    _passwordField.clearButtonMode = UITextFieldViewModeWhileEditing;
    _passwordField.secureTextEntry = YES;
    [self.view addSubview:_passwordField];
    

 

图片拉伸:第一个参数表示左边多少不拉伸(针对宽度), 第二个参数表示上面多少不拉伸(针对高度)

   UIImage *loginBtnImage = [[UIImage imageNamed:@"btn"] stretchableImageWithLeftCapWidth:10 topCapHeight:4];

 

格式化字符串:

    NSDateFormatter *dateToStringFormatter = [[NSDateFormatter alloc] init];

    [dateToStringFormatter setDateFormat:@"yyyy"];

    return [dateToStringFormatter stringFromDate:[NSDate date]];