导航栏使用UIButton自定义返回按钮的图片

- (void)viewDidLoad {

UIButton *backItem = [UIButton buttonWithType:UIButtonTypeCustom];

UIBarButtonItem *back = [[UIBarButtonItem alloc] initWithCustomView:backItem];

backItem.frame = CGRectMake(18, 5, 20, 20);

[backItem setImage:[UIImage imageNamed:@"返回 (6)"] forState:UIControlStateNormal];

[backItem addTarget:self action:@selector(backSection1) forControlEvents:UIControlEventTouchUpInside];

self.navigationItem.leftBarButtonItem = back;

}

-(void)backSection1{

if (viewcontrollers.count>1) {

　　if ([viewcontrollers objectAtIndex:viewcontrollers.count-1]==self) {

　　//push方式 [self.navigationController popViewControllerAnimated:YES];

　　}

} else{

//present方式 [self.navigationController dismissViewControllerAnimated:YES completion:nil];

}