??常?？吹胶枚鄳?yīng)用push出新界面時，導(dǎo)航欄下方會有一個進度條顯示，所以簡單的實現(xiàn)了一下這個效果。代碼如下：

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIProgressView *progressView;

@property (nonatomic, strong) NSTimer *longConnectTimer;

@property (nonatomic, assign) int time;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor greenColor];
    self.navigationController.navigationBar.barTintColor = [UIColor orangeColor];
    self.navigationItem.title = @"導(dǎo)航欄進度條";
    
    
//    // 導(dǎo)航欄底部添加進度條
//    self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 43, CGRectGetWidth(self.view.frame), 40000)];// 高度設(shè)置無效，默認是2
    // 狀態(tài)欄頂部添加進度條
    self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, -20, CGRectGetWidth(self.view.frame), 40000)];// 高度設(shè)置無效，默認是2
    self.progressView.backgroundColor = [UIColor clearColor];// 背景顏色，只有trackTintColor為透明色時，才能看到背景顏色
    self.progressView.progressTintColor = [UIColor purpleColor];// 進度部分的顏色
    self.progressView.trackTintColor = [UIColor clearColor];// 未進度部分的顏色
    
//    [self.navigationController.navigationBar addSubview:self.progressView];// 導(dǎo)航欄添加進度條方式一
    [self.navigationController.navigationBar.layer addSublayer:self.progressView.layer];// 導(dǎo)航欄添加進度條方式二


    self.time = 0;
    self.longConnectTimer = [NSTimer timerWithTimeInterval:1 target:self selector:@selector(longConnectToSocket) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:self.longConnectTimer forMode:NSRunLoopCommonModes];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)longConnectToSocket {
    self.time += 25;
    [self.progressView setProgress:(self.time / 100.0) animated:YES];
    if (100 == self.time) {
        self.time = 0;
    }
}

問題一： 不知道大家有沒有更好的實現(xiàn)方式，歡迎留言

問題二：

• 進度條的高度怎么改變？？通過設(shè)置transform 屬性progressView.transform = CGAffineTransformMakeScale(1.0f, 5.0f);有問題，就有進度條在進度時，一邊向有進度，一邊向下擴展高度，效果很糟糕。
• 怎樣讓進度條鋪滿整個導(dǎo)航欄的高度（高度64）來顯示進度，但是不遮住導(dǎo)航欄上的標題和按鈕等？？？？