Essential Books

010Trigger Impact Haptic

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Example shows how to trigger an impact haptic using UIImpactFeedbackGenerator after a button press.

Swift 

class ViewController: UIViewController
{
    lazy var button: UIButton =
    {
        let button = UIButton()
        button.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(button)
        button.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
        button.centerYAnchor.constraint(equalTo: self.view.centerYAnchor).isActive = true
        button.setTitle("Impact", for: .normal)
        button.setTitleColor(UIColor.gray, for: .normal)
        return button
    }()
    
    // Choose between heavy, medium, and light for style
    let impactFeedbackGenerator = UIImpactFeedbackGenerator(style: .heavy)
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        button.addTarget(self, action: #selector(self.didPressButton(sender:)), for: .touchUpInside)
				// Primes feedback generator for upcoming events and reduces latency
				impactFeedbackGenerator.prepare()
				}
				
				func didPressButton(sender: UIButton)
				{
					// Triggers haptic
					impactFeedbackGenerator.impactOccurred()
			  }
		}
}

Objective-C 

@interface ViewController ()
@property (nonatomic, strong) UIImpactFeedbackGenerator *impactFeedbackGenerator;
@property (nonatomic, strong) UIButton *button;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.button addTarget:self action:@selector(didPressButton:) forControlEvents:UIControlEventTouchUpInside];
    
    // Choose between heavy, medium, and light for style
    self.impactFeedbackGenerator = [[UIImpactFeedbackGenerator alloc] initWithStyle:UIImpactFeedbackStyleHeavy];
    
    // Primes feedback generator for upcoming events and reduces latency
    [self.impactFeedbackGenerator prepare];
}

- (void)didPressButton:(UIButton *)sender
{
    // Triggers haptic
    [self.impactFeedbackGenerator impactOccurred];
}

#pragma mark - Lazy Init
- (UIButton *)button
{
    if (!_button)
    {
        _button = [[UIButton alloc]init];
        _button.translatesAutoresizingMaskIntoConstraints = NO;
        [self.view addSubview:_button];
        [_button.centerXAnchor constraintEqualToAnchor:self.view.centerXAnchor].active = YES;
        [_button.centerYAnchor constraintEqualToAnchor:self.view.centerYAnchor].active = YES;
        [_button setTitle:@"Impact" forState:UIControlStateNormal];
        [_button setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
    }
    return _button;
}

@end
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UIFeedbackGenerator:
* UIFeedbackGenerator
* 010Trigger Impact Haptic
Table Of Contents
0 Getting started with iOS
1 UILabel
2 Change Status Bar Color
3 Passing Data between View Controllers
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94 XCode Build Archive From Command Line
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120 Handle Multiple Environment using Macro
121 Set View Background
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124 Google Places API
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128 UILabel text underlining
129 Cut a UIImage into a circle
130 Make selective UIView corners rounded
131 Convert HTML to NSAttributed string and vice versa
132 Convert NSAttributedString to UIImage
133 CoreImage Filters
134 Face Detection Using CoreImageOpenCV
135 MPMediaPickerDelegate
136 Graph Coreplot
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138 FCM Messaging
139 Create Custom Framework
140 Custom Keyboard
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142 SLComposeViewController
143 AirPrint tutorial
144 UISlider
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146 HealthKit
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150 QR Code Scanner
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153 UIRefreshControl TableView
154 WCSessionDelegate
155 AppDelegate
156 App Submission Process
157 MVVM
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159 Basic text file I/O
160 Text To Speech (TTS)
161 MPVolumeView
162 Objective-C Associated Objects
163 Passing Data between View Controllers
164 UIPhoenix
165 Blocks in Queue with MKBlockQueue
166 Simulator
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171 Cache online images
172 MVP Architecture
173 UIKit Dynamics
174 Configure Beacons with CoreBluetooth
175 Core Data
176 Extension for rich Push Notification
177 Profiling with Instruments
178 Application rating review request
179 MyLayout
180 UIFont
181 Simulator Builds
182 Simulating Location Using GPX files
183 Custom methods of selection of UITableViewCells
184 Custom methods of selection of UITableViewCells
185 UISegmentedControl
186 SqlCipher integration
187 Custom UITextField
188 Custom UITextField
189 Security
190 Guideline to architecture patterns
191 UIFeedbackGenerator
192 UIKit Dynamics with UICollectionView
193 Multicast Delegates
194 Using image assets
195 UITableViewCell
196 Runtime in Objective-C
197 ModelPresentationStyles
198 CydiaSubstrate tweak
199 Create a video from images
200 Codable
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205 Adding Swift bridging header
206 Creating an App ID
207 Changing the rootview controller
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