iOS系統(tǒng)導(dǎo)航欄中有l(wèi)eftBarButtonItem和rightBarButtonItem，我們可以根據(jù)自己的需求來(lái)自定義這兩個(gè)UIBarButtonItem。
四種創(chuàng)建方法
系統(tǒng)提供了四種創(chuàng)建的方法：
- (instancetype)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem target:(id)target action:(SEL)action;
- (instancetype)initWithImage:(UIImage *)image style:(UIBarButtonItemStyle)style target:(id)target action:(SEL)action;
- (instancetype)initWithTitle:(NSString *)title style:(UIBarButtonItemStyle)style target:(id)target action:(SEL)action;
- (instancetype)initWithBarButtonSystemItem:(UIBarButtonSystemItem)systemItem target:(id)target action:(SEL)action;
- (instancetype)initWithCustomView:(UIView *)customView;
通過(guò)系統(tǒng)UIBarButtonSystemItem創(chuàng)建
自定義rightBarButtonItem，代碼如下：
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(right:)];
UIBarButtonSystemItem有以下樣式可以供選擇：
typedef NS_ENUM(NSInteger, UIBarButtonSystemItem) {
UIBarButtonSystemItemDone,
UIBarButtonSystemItemCancel,
UIBarButtonSystemItemEdit,
UIBarButtonSystemItemSave,
UIBarButtonSystemItemAdd,
UIBarButtonSystemItemFlexibleSpace,
UIBarButtonSystemItemFixedSpace,
UIBarButtonSystemItemCompose,
UIBarButtonSystemItemReply,
UIBarButtonSystemItemAction,
UIBarButtonSystemItemOrganize,
UIBarButtonSystemItemBookmarks,
UIBarButtonSystemItemSearch,
UIBarButtonSystemItemRefresh,
UIBarButtonSystemItemStop,
UIBarButtonSystemItemCamera,
UIBarButtonSystemItemTrash,
UIBarButtonSystemItemPlay,
UIBarButtonSystemItemPause,
UIBarButtonSystemItemRewind,
UIBarButtonSystemItemFastForward,
#if __IPHONE_3_0 <= __IPHONE_OS_VERSION_MAX_ALLOWED
UIBarButtonSystemItemUndo,
UIBarButtonSystemItemRedo,
#endif
#if __IPHONE_4_0 <= __IPHONE_OS_VERSION_MAX_ALLOWED
UIBarButtonSystemItemPageCurl,
#endif
};
最后別忘了實(shí)現(xiàn)right:方法：
- (void)right:(id)sender
{
NSLog(@"rightBarButtonItem");
}
自定義文字的UIBarButtonItem
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"back" style:UIBarButtonItemStylePlain target:self action:@selector(back:)];
UIBarButtonItemStyle有以下三種選擇：
typedef NS_ENUM(NSInteger, UIBarButtonItemStyle) {
UIBarButtonItemStylePlain,
UIBarButtonItemStyleBordered NS_ENUM_DEPRECATED_IOS(2_0, 8_0, "Use UIBarButtonItemStylePlain when minimum deployment target is iOS7 or later"),
UIBarButtonItemStyleDone,
};
實(shí)現(xiàn)back:方法：
- (void)back:(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
自定義照片的UIBarButtonItem
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"test"] style:UIBarButtonItemStylePlain target:self action:@selector(right:)];
自定義UIView的UIBarButtonItem
自定義UIView，然后通過(guò)initWithCustomView:方法來(lái)創(chuàng)建UIBarButtonItem。
UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 40, 60)];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:testView];
看到有朋友在后臺(tái)提問(wèn)：
我現(xiàn)在即需要改那個(gè)導(dǎo)航原生的返回圖片，也要改返回文字，應(yīng)該怎么改呢，求指教。
其實(shí)，這個(gè)就可以用initWithCustomView:來(lái)解決，自定義UIView你可以放UIImageView和UILabel。可以自定義UIView，那么想怎么定義都是可以的。
下面來(lái)看一個(gè)有趣的例子：
先說(shuō)一下需求：
1.做一個(gè)RightBarButtonItem不斷旋轉(zhuǎn)的Demo；
2.點(diǎn)擊RightBarButtonItem 按鈕旋轉(zhuǎn)或暫停；
最終效果展示：
就是那個(gè)音符圖形的旋轉(zhuǎn)。
關(guān)鍵代碼展示（已加注釋?zhuān)?/p>
//
// ViewController.m
// NavigationBtn
//
#import "ViewController.h"
#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)
///ImageView旋轉(zhuǎn)狀態(tài)枚舉
typedef enum {
RotateStateStop,
RotateStateRunning,
}RotateState;
@interface ViewController ()
{
///旋轉(zhuǎn)角度
CGFloat imageviewAngle;
///旋轉(zhuǎn)ImageView
UIImageView *imageView;
///旋轉(zhuǎn)狀態(tài)
RotateState rotateState;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.title=@"微信公眾賬號(hào):樂(lè)Coding";
[self buildBarButtonItem];
}
#pragma mark 添加 RightBarButtonItem
-(void)buildBarButtonItem{
imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"icon"]];
imageView.autoresizingMask = UIViewAutoresizingNone;
imageView.contentMode = UIViewContentModeScaleToFill;
imageView.bounds=CGRectMake(0, 0, 40, 40);
//設(shè)置視圖為圓形
imageView.layer.masksToBounds=YES;
imageView.layer.cornerRadius=20.f;
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, 0, 40, 40);
[button addSubview:imageView];
[button addTarget:self action:@selector(animate) forControlEvents:UIControlEventTouchUpInside];
imageView.center = button.center;
//設(shè)置RightBarButtonItem
UIBarButtonItem *barItem = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationItem.rightBarButtonItem = barItem;
}
#pragma mark 點(diǎn)擊 RightBarButtonItem
- (void)animate {
//改變ImageView旋轉(zhuǎn)狀態(tài)
if (rotateState==RotateStateStop) {
rotateState=RotateStateRunning;
[self rotateAnimate];
}else{
rotateState=RotateStateStop;
}
}
#pragma mark 旋轉(zhuǎn)動(dòng)畫(huà)
-(void)rotateAnimate{
imageviewAngle+=50;
//0.5秒旋轉(zhuǎn)50度
[UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationOptionCurveLinear animations:^{
imageView.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(imageviewAngle));
} completion:^(BOOL finished) {
if (rotateState==RotateStateRunning) {
[self rotateAnimate];
}
}];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
