////  ViewController.m//  UIProgressView////  Created by City--Online on 15/5/18.//  Copyright (c) 2015年 XQB. All rights reserved.// #import "ViewController.h" @interface ViewController ()@property(nonatomic,strong) UIProgressView *progress;@property(nonatomic,strong) NSTimer *timer;@end @implementation ViewController - (void)viewDidLoad {    [super viewDidLoad];    //设置的高度对进度条的高度没影响，整个高度=进度条的高度，进度条也是个圆角矩形    //但slider滑动控件：设置的高度对slider也没影响，但整个高度=设置的高度，可以设置背景来检验     _progress=[[UIProgressView alloc]initWithFrame:CGRectMake(20, 200, 300, 10)];//    typedef NS_ENUM(NSInteger, UIProgressViewStyle) {//        UIProgressViewStyleDefault,     // normal progress bar//        UIProgressViewStyleBar,         // for use in a toolbar//    };    //两种几乎无区别    _progress.progressViewStyle=UIProgressViewStyleDefault;    //进度颜色//    _progress.progressTintColor=[UIColor redColor];//    //背景色//    _progress.backgroundColor=[UIColor blueColor];//    //进度条颜色//    _progress.trackTintColor=[UIColor yellowColor];    //进度的背景图片    _progress.progressImage=[UIImage imageNamed:@"2.jpg"];    //进度条的背景图片    _progress.trackImage=[UIImage imageNamed:@"1.jpg"];    [self.view addSubview:_progress];    _timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(btnClick:) userInfo:nil repeats:YES];    [_timer fire];}-(void)btnClick:(UIButton *)sender{    if (_progress.progress<0.95) {        _progress.progress+=0.05;     }    else    {        [_timer invalidate];    }     } - (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.} @end

 设置的progressImage、trackImage属性不起作用,网上搜了好多，说是IOS7之后没有效果