在导航条的下方加上阴影 navgationbar

来源：互联网发布：施工现场平面布置软件编辑：程序博客网时间：2024/05/20 14:27
工程需要包含 QuartzCore.Framework。
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//
//  UINavigationBar+JTDropShadow.h
//
//  Created by james on 9/20/11.
// http://ioscodesnippet.tumblr.com
//
 
 
#import
 
@interfaceUINavigationBar (JTDropShadow)
 
- (void)dropShadowWithOffset:(CGSize)offset
                     radius:(CGFloat)radius
                      color:(UIColor*)color
                    opacity:(CGFloat)opacity;
 
 
@end
 
 
 
 
//
//  UINavigationBar+JTDropShadow.m
//
//  Created by james on 9/20/11.
// http://ioscodesnippet.tumblr.com
//
 
 
#import "UINavigationBar+JTDropShadow.h"
 
#import
 
 
 
@implementationUINavigationBar (JTDropShadow)
 
- (void)dropShadowWithOffset:(CGSize)offset
                     radius:(CGFloat)radius
                      color:(UIColor*)color 
                    opacity:(CGFloat)opacity {
 
    // Creating shadow path for better performance
    CGMutablePathRefpath = CGPathCreateMutable();
    CGPathAddRect(path,NULL,self.bounds);
    self.layer.shadowPath= path;
    CGPathCloseSubpath(path);
    CGPathRelease(path);
 
    self.layer.shadowColor= color.CGColor;
    self.layer.shadowOffset= offset;
    self.layer.shadowRadius= radius;
    self.layer.shadowOpacity= opacity;
 
    // Default clipsToBounds is YES, will clip off the shadow, so we disable it.
    self.clipsToBounds= NO;
 
}
 
@end
 
 
//用法如下
 
- (void)viewDidLoad {
    [superviewDidLoad];
    ...
    [self.navigationController.navigationBardropShadowWithOffset:CGSizeMake(0,3)
                                                          radius:1
                                                           color:[UIColordarkGrayColor]
                                                         opacity:1];
    ...
}
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