iOS中Navbar设置渐变色效果的方法示例

#import "NavigationViewController.h"
#define LBColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]

@interface NavigationViewController ()
@end

@implementation NavigationViewController

-(UIStatusBarStyle)preferredStatusBarStyle{
 return UIStatusBarStyleLightContent;
}


- (void)viewDidLoad {
 [super viewDidLoad];
 // Do any additional setup after loading the view.

 self.navigationBar.translucent = YES;
 CAGradientLayer *gradientLayer = [CAGradientLayer layer];
 UIColor *color1= LBColor(255, 70, 93);
 UIColor *color2 = LBColor(251, 108, 42);
 gradientLayer.colors = @[(__bridge id)color1.CGColor, (__bridge id)color2.CGColor];
 gradientLayer.locations = @[@0.5, @1.0];
 gradientLayer.startPoint = CGPointMake(0, 0);
 gradientLayer.endPoint = CGPointMake(1.0, 0);
 gradientLayer.frame = CGRectMake(0, -20, self.view.frame.size.width, 64);
 [self.navigationBar.layer addSublayer:gradientLayer];

}