UIButton *btnTrans = [UIButton buttonWithType:UIButtonTypeCustom];
[btnTrans setBackgroundImage:[UIImage imageNamed:@"btnAround.png"] forState:UIControlStateNormal];
[btnTrans setTitle:@"周边" forState:UIControlStateNormal];
[btnTrans setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
btnTrans.titleLabel.font = [UIFont systemFontOfSize:12];
btnTrans.frame = CGRectMake(0.0, 0.0, 50, 31);
[btnTrans addTarget:self action:@selector(backBtnAction 
forControlEvents:UIControlEventTouchUpInside];
tempButton = [[UIBarButtonItem alloc] initWithCustomView:btnTrans];
//tempButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"btnAround.png"] style:UIBarButtonItemStyleDone target:self action:@selector(backBtnAction:)];
self.navigationItem.leftBarButtonItem = tempButton;