自定义导航栏按钮

首先，写一个类，继承于UIButton。

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头文件：

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#import <Foundation/Foundation.h>@interface BlueButton : UIButton {}- (id)init;@end

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实现文件：

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#import "BlueButton.h"@implementation BlueButton- (id)init {  if(self = [super init]) {    self.frame = CGRectMake(0, 0, 49.0, 30.0);    self.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;    self.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;    UIImage *image = [UIImage imageNamed:@"blueButton.jpg"];    UIImage *stretchImage = [image stretchableImageWithLeftCapWidth:15.0 topCapHeight:0.0];    [self setBackgroundImage:stretchImage forState:UIControlStateNormal];    self.backgroundColor = [UIColor clearColor];    [self setTitleShadowColor:[UIColor blackColor] forState:UIControlStateNormal];    self.titleShadowOffset = CGSizeMake(0, -1);    self.titleLabel.font = [UIFont boldSystemFontOfSize:13];  }  return self;}@end

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示例：

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- (void)viewDidLoad {[super viewDidLoad];BlueButton *blueButton = [[BlueButton alloc] init];[blueButton setTitle:@"Add" forState:UIControlStateNormal];[blueButton addTarget:self action:@selector(add) forControlEvents:UIControlEventTouchUpInside];UIBarButtonItem *button = [[UIBarButtonItem alloc] initWithCustomView:blueButton];self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(Cancel)];self.navigationItem.rightBarButtonItem = button;[button release];[blueButton release];}

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示例图：