I created a new project. I linked QuartzCore.framework
and imported <QuartzCore/QuartzCore.h>
in the ViewController.m
.
And here is the code.
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"view height %f", self.view.frame.size.height); // returns 667 on iPhone 6
NSLog(@"view width %f", self.view.frame.size.width); // returns 375 on iPhone 6
NSLog(@"layers count %lu", self.view.layer.sublayers.count); // returns 2
// Gradient
UIColor *colorOne = [UIColor blueColor];
UIColor *colorTwo = [UIColor greenColor];
NSArray *colorArray = @[colorOne, colorTwo];
NSNumber *locationOne = [NSNumber numberWithFloat:0.0];
NSNumber *locationTwo = [NSNumber numberWithFloat:1.0];
NSArray *locationArray = @[locationOne, locationTwo];
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.frame = self.view.frame;
gradientLayer.colors = colorArray;
gradientLayer.locations = locationArray;
[self.view.layer insertSublayer:gradientLayer atIndex:0];
//[self.view.layer insertSublayer:gradientLayer above:[self.view.layer.sublayers firstObject]]; // didn't work either
NSLog(@"layers count %lu", self.view.layer.sublayers.count); //returns 3
}
I tried setting the view's background color to clearColor
, calling it in the viewDidAppear
, but none of them worked. I really don't know what I'm missing. Thanks in any help.
Your color array should be NSArray *colorArray = @[(id)colorOne.CGColor, (id)colorTwo.CGColor];
, because the colors
array takes CGColorRef
s, rather than UIColor
s, annoyingly enough - see the CGGradientLayer docs
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