在导航条的下方加上阴影 navgationbar

工程需要包含 QuartzCore.Framework。

//
// UINavigationBar+JTDropShadow.h
//
// Created by james on 9/20/11.
// http://ioscodesnippet.tumblr.com
//


#import

@interface UINavigationBar (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



@implementation UINavigationBar (JTDropShadow)

- ( void )dropShadowWithOffset:(CGSize)offset
radius :(CGFloat)radius
color :( UIColor *)color
opacity :(CGFloat)opacity {

// Creating shadow path for better performance
CGMutablePathRef path = 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 {
[ super viewDidLoad ];
...
[ self .navigationController .navigationBar dropShadowWithOffset :CGSizeMake( 0 , 3 )
radius : 1
color :[ UIColor darkGrayColor ]
opacity : 1 ];
...
}

Tag