iOS不断旋转的UIBarButtonItem

做一个不断旋转的View简单，但是怎样让UIBarButtonItem旋转起来呢。

一、先说一下需求：
1.做一个RightBarButtonItem不断旋转的Demo；
2.点击RightBarButtonItem 按钮旋转或暂停；

三、关键代码展示（已加注释）：

//

// ViewController.m

// NavigationBtn

//

// Created by Lves Li on 15/3/1.

// Copyright (c) 2015年 Lves. All rights reserved.

//

#import "ViewController.h"

#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)

///ImageView旋转状态枚举

typedef enum {

RotateStateStop,

RotateStateRunning,

}RotateState;

@interface ViewController ()

{

///旋转角度

CGFloat imageviewAngle;

///旋转ImageView

UIImageView *imageView;

///旋转状态

RotateState rotateState;

}

@end

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

self.title=@"微信公众账号:乐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);

//设置视图为圆形

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;

//设置RightBarButtonItem

UIBarButtonItem *barItem = [[UIBarButtonItem alloc] initWithCustomView:button];

self.navigationItem.rightBarButtonItem = barItem;

}

#pragma mark 点击 RightBarButtonItem

- (void)animate {

//改变ImageView旋转状态

if (rotateState==RotateStateStop) {

rotateState=RotateStateRunning;

[self rotateAnimate];

}else{

rotateState=RotateStateStop;

}

}

#pragma mark 旋转动画

-(void)rotateAnimate{

imageviewAngle+=50;

//0.5秒旋转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