vb.net print barcode labels Monitoring events and actions in Objective-C

Painting Quick Response Code in Objective-C Monitoring events and actions

Download from Wow! eBook <www.wowebook.com>
Generating QR Code 2d Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create QR Code image in iPhone applications.
www.OnBarcode.com
UPC-A Creator In Objective-C
Using Barcode creation for iPhone Control to generate, create UCC - 12 image in iPhone applications.
www.OnBarcode.com
Monitoring events and actions
Barcode Maker In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Paint Barcode In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
UISearchBar isn t a UIControl object but instead follows an entirely different methodology. To use a UISearchBar, set its delegate to be the object of your choice, likely your view controller. Then, respond to the half-dozen messages described in UISearchBarDelegate. The most important of these is the searchBarSearchButtonClicked: method. Be sure to include resignFirstResponder in order to clear the keyboard; then, you can take actions based on the results. There s an example of a UISearchBar in chapter 9, section 9.3.3.
DataMatrix Generation In Objective-C
Using Barcode creation for iPhone Control to generate, create Data Matrix 2d barcode image in iPhone applications.
www.OnBarcode.com
GS1-128 Encoder In Objective-C
Using Barcode drawer for iPhone Control to generate, create EAN128 image in iPhone applications.
www.OnBarcode.com
UITEXTVIEW
Encode Barcode In Objective-C
Using Barcode creation for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Generating GTIN - 12 In Objective-C
Using Barcode creator for iPhone Control to generate, create UCC - 12 image in iPhone applications.
www.OnBarcode.com
A UITextView works like a UITextField, except that it allows users to enter many lines of text. The biggest gotcha here is that you can t use the Return key as your Done button, because users will likely want to hit Returns in their text. Instead, you must have a Done button somewhere near the top of your screen, where it can be seen when the keyboard is up. When that button is clicked, you can set the text view to resignFirstResponder. Beyond that, you must set the UITextView s delegate property; then you can watch for delegate messages, most importantly textViewDidEndEditing:. With the quick digression into this variety of text objects out of the way, we can now return to the other UIControl object that we wanted to discuss: UISlider.
Generating QR Code In Objective-C
Using Barcode maker for iPad Control to generate, create QR image in iPad applications.
www.OnBarcode.com
Draw Denso QR Bar Code In .NET
Using Barcode creation for .NET Control to generate, create Quick Response Code image in VS .NET applications.
www.OnBarcode.com
Allowing value selection with UISlider
Scan EAN-13 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
UPC - 13 Encoder In VS .NET
Using Barcode creation for ASP.NET Control to generate, create GTIN - 13 image in ASP.NET applications.
www.OnBarcode.com
The slider is a simple object, but we ve singled it out because it s the one other class that has its own control event, UIControlEventValueChanged. If you target this event, you ll find that it gets called whenever the slider moves, but the control event won t tell you what the new value is. To get that information, your action method must query the slider s properties. Three properties are of particular note: value shows a slider s current value, minimumValue shows the bottom of its scale, and maximumValue shows the top of its scale. You can use the value without modification if you ve set your slider to return a reasonable number (as described in the class reference); or if you prefer, you can use all three properties together to determine the percentage that the slider is moved over which is what you ll do in one final control example.
Code 128C Maker In None
Using Barcode generator for Excel Control to generate, create Code 128 Code Set B image in Office Excel applications.
www.OnBarcode.com
QR Code ISO/IEC18004 Creation In None
Using Barcode maker for Office Excel Control to generate, create Denso QR Bar Code image in Office Excel applications.
www.OnBarcode.com
A TextField/Slider mashup
Barcode Creator In Java
Using Barcode encoder for Eclipse BIRT Control to generate, create Barcode image in BIRT reports applications.
www.OnBarcode.com
Read Code 128B In Visual C#
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Because we want to examine two UIControl objects more closely, it makes sense to quickly mash up an example that takes advantage of both of them. You ll do this in the View-Based RGB Application, which sets the background color of a view based on the word you type into a UITextField and the selected position of a UISlider. As usual, you create all of these objects in Interface Builder. Then, go hog wild linking objects to your view controller. In all, you should create five links: an outlet each for your text field and slider, an action link for the important text field and the slider events, and a delegate link for the text field. Figure 6.8 shows what the view controller s Connections tab looks like after these have all been done.
UCC - 12 Encoder In VB.NET
Using Barcode maker for VS .NET Control to generate, create EAN / UCC - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
Recognizing Barcode In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Download from Wow! eBook <www.wowebook.com>
Code 128 Code Set A Creator In None
Using Barcode creation for Microsoft Word Control to generate, create Code128 image in Microsoft Word applications.
www.OnBarcode.com
Scan Barcode In VB.NET
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in VS .NET applications.
www.OnBarcode.com
Other action functionality
Figure 6.8 A heavily connected view controller will be a pretty normal sight as you gain experience in creating objects in Interface Builder.
As shown, the actions from both of the controls link into a single method, called changeColor:. Whenever either control is changed, this method adjusts the color of the screen accordingly. Listing 6.2 shows how.
Listing 6.2 Accessing a text field and a slider
- (IBAction)changeColor:(id)sender { int red; int green; int blue; if ([myText.text caseInsensitiveCompare:@"red"] == NSOrderedSame) { red = 1; green = 0; blue = 0; } else if ([myText.text caseInsensitiveCompare:@"blue"] Checks == NSOrderedSame) { text red = 0; green = 0; blue = 1; input } else if ([myText.text caseInsensitiveCompare:@"green"] == NSOrderedSame) { red = 0; green = 1; blue = 0; } else { red = .5; green = .5; blue = .5; } float newShade = mySlider.value / Calculates alpha percentage (mySlider.maximumValue - mySlider.minimumValue); [self.view setBackgroundColor: [UIColor colorWithRed:red green:green blue:blue alpha:newShade]]; }
The hardest part of working with a UITextField is setting it up, which you did earlier. Now that you have input coming back, all you need to do is access the text property and do with it as you will B. Meanwhile, by working with your three slider values, you re able to easily generate a value from 0 to 1 C. Putting that together with the color you generated from your text field input results in a background color that you can change in two ways. Figure 6.9 takes a final look at this new program. Would it be better to do this with a UISegmentedControl and a UISlider Probably. But as is, it offers a quick example of how a text field works. Furthermore, it shows
Copyright © OnBarcode.com . All rights reserved.