常常看到好多应用push出新界面时，导航栏下方会有一个进度条显示，所以简单的实现了一下这个效果。代码如下：
#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 = @"导航栏进度条";
// // 导航栏底部添加进度条
// self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 43, CGRectGetWidth(self.view.frame), 40000)];// 高度设置无效，默认是2
// 状态栏顶部添加进度条
self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, -20, CGRectGetWidth(self.view.frame), 40000)];// 高度设置无效，默认是2
self.progressView.backgroundColor = [UIColor clearColor];// 背景颜色，只有trackTintColor为透明色时，才能看到背景颜色
self.progressView.progressTintColor = [UIColor purpleColor];// 进度部分的颜色
self.progressView.trackTintColor = [UIColor clearColor];// 未进度部分的颜色
// [self.navigationController.navigationBar addSubview:self.progressView];// 导航栏添加进度条方式一
[self.navigationController.navigationBar.layer addSublayer:self.progressView.layer];// 导航栏添加进度条方式二
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;
}
}
问题一： 不知道大家有没有更好的实现方式，欢迎留言
问题二：
- 进度条的高度怎么改变？？通过设置transform 属性progressView.transform = CGAffineTransformMakeScale(1.0f, 5.0f);有问题，就有进度条在进度时，一边向有进度，一边向下扩展高度，效果很糟糕。
- 怎样让进度条铺满整个导航栏的高度（高度64）来显示进度，但是不遮住导航栏上的标题和按钮等？？？？
