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Shake view animation

-(void)shakeView {

CABasicAnimation *shake = [CABasicAnimation animationWithKeyPath:@"position"];

[shake setDuration:0.1];

[shake setRepeatCount:2];

[shake setAutoreverses:YES];

[shake setFromValue:[NSValue valueWithCGPoint:

CGPointMake(view.center.x - 5,view.center.y)]];

[shake setToValue:[NSValue valueWithCGPoint:

CGPointMake(view.center.x + 5, view.center.y)]];

[view.layer addAnimation:shake forKey:@"position"];

AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

}

Open link with safari browser iOS

NSURL *url = [NSURL URLWithString:@"http://www.stackoverflow.com"];
if (![[UIApplication sharedApplication] openURL:url]) {
    NSLog(@"%@%@",@"Failed to open url:",[url description]);
}

NSURL *url = [NSURL URLWithString:@"http://www.stackoverflow.com"];

if (![[UIApplication sharedApplication] openURL:url]) {
    NSLog(@"%@%@",@"Failed to open url:",[url description]);
}

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://www.google.com"]];

How to detect System sound volume

float vol = [[AVAudioSession sharedInstance] outputVolume];
NSLog(@"output volume: %1.2f dB", 20.f*log10f(vol+FLT_MIN));

 MPMusicPlayerController *iPod = [MPMusicPlayerController iPodMusicPlayer];    float volumeLevel = iPod.volume;

Add auto layout

Add table view

self.tableView = [[UITableView alloc] init];

[self.view addSubview:self.tableView];

[self.tableView setTranslatesAutoresizingMaskIntoConstraints:NO];

Visual Style

id viewsDictionary = @{@"tblview": self.tableView};

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[tblview]-5-|" options:0 metrics:nil views:viewsDictionary]];

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-20-[tblview]-60-|" options:0 metrics:nil views:viewsDictionary]];

Normal Style

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.tableView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0 constant:5.0]];

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.tableView attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:5.0]];

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.tableView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1.0 constant:20.0]];