我有一个 CALayer 背景,使用:
CAGradientLayer *bgLayer = [BackgroundLayer blueGradient];
bgLayer.frame = self.view.bounds;
[self.view.layer insertSublayer:bgLayer atIndex:0];
在
- (void)prepareToRotate:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
我使用这条线来旋转 CALayer 背景。
[[[self.view.layer sublayers] objectAtIndex:0] setFrame:self.view.bounds];
我得到了一些不漂亮的撕裂效果,因为图层似乎旋转得不够快,我该如何解决这个问题并在旋转时获得无缝效果,有没有更好的方法来调整 calayer 的大小?
谢谢,
编辑:我所有的代码:
.h:
#import <Foundation/Foundation.h>
#import <QuartzCore/QuartzCore.h>
@interface BackgroundLayer : NSObject
+(CAGradientLayer*) greyGradient;
+(CAGradientLayer*) blueGradient;
@end
他们
#import "BackgroundLayer.h"
@implementation BackgroundLayer
//Metallic grey gradient background
+ (CAGradientLayer*) greyGradient {
UIColor *colorOne = [UIColor colorWithWhite:0.9 alpha:1.0];
UIColor *colorTwo = [UIColor colorWithHue:0.625 saturation:0.0 brightness:0.85 alpha:1.0];
UIColor *colorThree = [UIColor colorWithHue:0.625 saturation:0.0 brightness:0.7 alpha:1.0];
UIColor *colorFour = [UIColor colorWithHue:0.625 saturation:0.0 brightness:0.4 alpha:1.0];
NSArray *colors = [NSArray arrayWithObjects:(id)colorOne.CGColor, colorTwo.CGColor, colorThree.CGColor, colorFour.CGColor, nil];
NSNumber *stopOne = [NSNumber numberWithFloat:0.0];
NSNumber *stopTwo = [NSNumber numberWithFloat:0.02];
NSNumber *stopThree = [NSNumber numberWithFloat:0.99];
NSNumber *stopFour = [NSNumber numberWithFloat:1.0];
NSArray *locations = [NSArray arrayWithObjects:stopOne, stopTwo, stopThree, stopFour, nil];
CAGradientLayer *headerLayer = [CAGradientLayer layer];
headerLayer.colors = colors;
headerLayer.locations = locations;
return headerLayer;
}
//Blue gradient background
+ (CAGradientLayer*) blueGradient {
UIColor *colorOne = [UIColor colorWithRed:(120/255.0) green:(135/255.0) blue:(150/255.0) alpha:1.0];
UIColor *colorTwo = [UIColor colorWithRed:(57/255.0) green:(79/255.0) blue:(96/255.0) alpha:1.0];
NSArray *colors = [NSArray arrayWithObjects:(id)colorOne.CGColor, colorTwo.CGColor, nil];
NSNumber *stopOne = [NSNumber numberWithFloat:0.0];
NSNumber *stopTwo = [NSNumber numberWithFloat:1.0];
NSArray *locations = [NSArray arrayWithObjects:stopOne, stopTwo, nil];
CAGradientLayer *headerLayer = [CAGradientLayer layer];
headerLayer.colors = colors;
headerLayer.locations = locations;
return headerLayer;
}
@end
准备旋转被简单地调用
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
[self prepareToRotate:[[UIApplication sharedApplication] statusBarOrientation] duration:0];
}
并且只包含
[[[self.view.layer sublayers] objectAtIndex:0] setFrame:self.view.bounds];