小编kir*_*ran的帖子

CGContextRef currentContext = UIGraphicsGetCurrentContext();
UIGraphicsBeginImageContext(drawImage.frame.size);
[drawImage.image drawInRect:CGRectMake(0,0, drawImage.frame.size.width, drawImage.frame.size.height)];

CGContextSetRGBStrokeColor(currentContext, 0.0, 0.0, 0.0, 1.0);
UIBezierPath *path=[self pathFromPoint:currentPoint 
                               toPoint:currentPoint];

CGContextBeginPath(currentContext);
CGContextAddPath(currentContext, path.CGPath);
CGContextDrawPath(currentContext, kCGPathFill);
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();

在上面CGContextRef currentContext 创建的代码中UIGraphicsGetCurrentContext(),将它传递给 CGContextBeginPath CGContextAddPath CGContextDrawPath currentContext有参数,它对我不起作用!当我在做的时候touchMovie.

当我直接UIGraphicsGetCurrentContext()代替currentContext它为我工作.我想知道为什么会那样？

@All请告诉我这个问题.

如何将自定义UIBarButtonItem添加到导航栏右侧.

public UIBarButtonItem btn_Cart {get; set;}

public DetailedController (){
string buttonTitle = "One";
btn_Cart = new UIBarButtonItem (buttonTitle, UIBarButtonItemStyle.Bordered, null);
btn_Cart.Clicked += (s, e) => { new UIAlertView ("click!", "btnOne clicked", null, "OK", null).Show (); 
};

}

public override void ViewDidLoad (){
base.ViewDidLoad ();
// Added btn_Cart to RightSide Of Naviation Bar.
this.NavigationItem.SetRightBarButtonItem (btn_Cart, true);
}

它没有添加到navigationItem.

如果我将我的代码更改为

public override void ViewDidLoad (){
this.NavigationItem.SetRightBarButtonItem(
                new UIBarButtonItem(UIImage.FromBundle ("Image.png")
                    , UIBarButtonItemStyle.Plain
                    , (sender,args) => {
new UIAlertView ("click!", "btnOne clicked", null, "OK", …

运行应用程序观察器后，[MC] Invalidating cache控制台中将继续显示消息。

为了删除我已经添加了"Environment Variables"添加的OS_ACTIVITY_MODESet的Edit Schemedisable

如何停止[MC] Invalidating cache无OS_ACTIVITY_MODE设定值的继续显示disable

我是一名从事iphone绘画应用的初学者.

为我的iPhone应用程序添加新工具称为喷枪...

这将喷涂在UIImageView上.任何人都可以帮助我如何使用它.

如何将字符串参数传递给EventHandler？

ViewController(A)书面事件处理程序

    public event EventHandler ValueChanged; 

    void ResponseCompleted(object sender, CommonCode.ResponseEventArgs e){
        this.InvokeOnMainThread (delegate { 

        if (ValueChanged != null) {
        ValueChanged (this, new EventArgs (e.ResponseData));
// e.ResponseData is an String datatype.
         }
     });
    }

的ViewController(B)

relatedDataSource.ValueChanged += delegate {
 Get Response Data from ViewControllerA
}

使用XCTExpectFailure并运行测试用例时 ( Cmd + U) 从“显示测试导航器”中，它显示灰色十字 (x) 其他测试用例以绿色显示。

测试用例中的灰色指示器 (x) 是什么？

需要在这里做什么吗？

例如:

@interface ClassToAddMethodsTo (category1,category2,category3) 
  ...methods go here
@end

如何检查在db数据库中创建表的位置.

var folder = Environment.GetFolderPath (Environment.SpecialFolder.Personal);
        SQLiteConnection db = new SQLiteConnection (System.IO.Path.Combine (folder,"note.db"));
        try{
            var existTable = db.Query<TransationTable>("SELECT count(*) FROM sqlite_master WHERE type = 'Table' AND name = 'TransationTable' ");
            Console.WriteLine ("Count {0}",existTable.Count);
          if(existTable.Count == 0){
          tableview.Hidden = true;
          lbl_NotFound.Hidden = false;
        }
    else{
          tableview.Hidden = false;
          lbl_NotFound.Hidden = true;
    }

        }
        catch{
            Console.WriteLine ("Calling Excpetion!");
        }
 }

它总是给我数数1.
@thanks提前.

如何从uiviewcontroller对象resignFirstResponder处于活动状态.

我有五个文本域一,二,三,四,五.

   - (void)removeKeyBoard{
     [one resignFirstResponder];
     [two resignFirstResponder];
     [three resignFirstResponder];
     [four resignFirstResponder];
     [five resignFirstResponder];
    }

上面的代码完成了我的工作,但每个对象引用都指定了resignFirstResponder.

有没有办法,处理resignFirstResponser哪个字段是活动的,UIViewController自动重新签名该对象.

@All先谢谢.

球队,

我有UITableView,其中有50多个细胞计数.每个细胞的宽度是60.

当我向上滚动到20个单元格时,然后点击任何单元格

它给出了索引路径值高于单元格值而不是单击单元格值

在CellForRowAtIndexPath里面

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    [[cell checkButton] addTarget:self action:@selector(checkButtonAction:) forControlEvents:UIControlEventTouchUpInside];

}

   -(void)checkButtonAction:(id)sender

    CGPoint touchPoint = [sender convertPoint:CGPointZero toView:self.tableview];

    NSIndexPath *indexPath = [self.tableview indexPathForRowAtPoint:touchPoint];

    UIButton *button = (UIButton *)sender;

 }

如果选择的索引是21给出索引20,则保持索引计数从零开始.

这个问题在iOS 10.1 iphone 7 plus设备中观察到,不在模拟器iPhone 7加iOS 10.1(14B72)中

调试值{length = 2,path = 0 - 14}

NSIndexPath路径应为0 - 15但它给出0 - 14.