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标题 iOS疯狂详解之自定义状态栏代码解析
内容
    这里说明一下，Apple没有开放的状态栏的API，在ios 的官方文档没有提到修改Window Level的方式;
    先看一下Window Level的可用的值包括：
    1: typedef CGFloat UIWindowLevel;
    2: const UIWindowLevel UIWindowLevelNormal; // 0.0
    3: const UIWindowLevel UIWindowLevelAlert; // 2000.0
    4: const UIWindowLevel UIWindowLevelStatusBar; // 1000.0
    默认我们的UIView layer都是在UIWindowLevelNormal上，这也就是为什么系统弹出来的对话框在我们的视图之上，因为它的Window Level级别更高。
    根据WindowLevel的原理我们也就知道，如果想在系统的状态栏上，添加自定义的状态栏，就需要比UIWindowLevelStatusBar的级别更高，接下来，用代码说明一下：
    首先，先建一个Single View Application，名字自定义就可以了，
    然后，新建一个类命名为： StatusBarOverlay 继承自UIWindow类，代码：
    StatusBarOverlay.h文件
    1: #import
    2:
    3: @interface StatusBarOverlay : UIWindow{
    4: UIView *contentView;
    5: UILabel *textLabel;
    6: }
    7:
    8: @property (nonatomic, retain) UIView *contentView;
    9:
    10: @property (nonatomic, retain) UILabel *textLabel;
    11:
    12: @end
    StatusBarOverlay.m文件
    1: //
    2: // StatusBarOverlay.m
    3: // StatusBarDemo
    4: //
    5: // Created by jordy wang on 12-8-7.
    6: // Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
    7: //
    8:
    9: #import "StatusBarOverlay.h"
    10:
    11: #define STATUS_BAR_ORIENTATION [UIApplication sharedApplication].statusBarOrientation
    12: #define ROTATION_ANIMATION_DURATION [UIApplication sharedApplication].statusBarOrientationAnimationDuration
    13:
    14:
    15: @interface StatusBarOverlay()
    16:
    17: - (void)initializeToDefaultState;
    18: - (void)rotateStatusBarWithFrame:(NSValue *)frameValue;
    19: - (void)setSubViewHFrame;
    20: - (void)setSubViewVFrame;
    21: @end
    22:
    23:
    24: @implementation StatusBarOverlay
    25: @synthesize contentView;
    26: @synthesize textLabel;
    27:
    28: //重写init方法
    29: - (id)init
    30: {
    31: self = [super initWithFrame:CGRectZero];
    32: if (self) {
    33: self.windowLevel = UIWindowLevelStatusBar + 1;
    34: self.frame = [UIApplication sharedApplication].statusBarFrame;
    35: [self setBackgroundColor:[UIColor orangeColor]];
    36: [self setHidden:NO];
    37:
    38: //内容视图
    39: UIView *_contentView = [[UIView alloc] initWithFrame:self.bounds];
    40: self.contentView = _contentView;
    41: [self.contentView setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
    42: [self.contentView setBackgroundColor:[UIColor cyanColor]];
    43: [self addSubview:self.contentView];
    44: [_contentView release];
    45:
    46:
    47: //添加textLabel
    48: UILabel *_textLabel = [[UILabel alloc] initWithFrame:CGRectMake(30, 0, CGRectGetWidth(self.frame)-60, CGRectGetHeight(self.frame))];
    49: self.textLabel = _textLabel;
    50: [self.textLabel setBackgroundColor:[UIColor blueColor]];
    51: [self.textLabel setFont:[UIFont systemFontOfSize:12]];
    52: [self.textLabel setTextAlignment:UITextAlignmentCenter];
    53: [self.textLabel setTextColor:[UIColor blackColor]];
    54: [self.textLabel setText:@"自定义的状态栏 author by jordy"];
    55: [self.contentView addSubview:self.textLabel];
    56: [_textLabel release];
    57:
    58: //注册监听---当屏幕将要转动时，所出发的事件(用于操作本视图改变其frame)
    59: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willRotateScreenEvent:) name:UIApplicationWillChangeStatusBarFrameNotification object:nil];
    60: //初始化
    61: [self initializeToDefaultState];
    62: }
    63:
    64: return self;
    65: }
    66:
    67:
    68:
    69:
    70: //初始化为默认状态
    71: - (void)initializeToDefaultState
    72: {
    73: //获取当前的状态栏位置
    74: CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
    75: //设置当前视图的旋转, 根据当前设备的朝向
    76: [self rotateStatusBarWithFrame:[NSValue valueWithCGRect:statusBarFrame]];
    77:
    78:
    79:
    80: }
    81:
    82:
    83: //旋转屏幕
    84: - (void)rotateStatusBarWithFrame:(NSValue *)frameValue
    85: {
    86: CGRect frame = [frameValue CGRectValue];
    87: UIInterfaceOrientation orientation = STATUS_BAR_ORIENTATION;
    88:
    89: if (orientation == UIDeviceOrientationPortrait) {
    90: self.transform = CGAffineTransformIdentity; //屏幕不旋转
    91: [self setSubViewVFrame];
    92: }else if (orientation == UIDeviceOrientationPortraitUpsideDown) {
    93: self.transform = CGAffineTransformMakeRotation(M_PI); //屏幕旋转180度
    94: [self setSubViewVFrame];
    95: }else if (orientation == UIDeviceOrientationLandscapeRight) {
    96: self.transform = CGAffineTransformMakeRotation((M_PI * (-90.0f) / 180.0f)); //屏幕旋转-90度
    97: [self setSubViewHFrame];
    98: }else if (orientation == UIDeviceOrientationLandscapeLeft){
    99: self.transform = CGAffineTransformMakeRotation(M_PI * 90.0f / 180.0f); //屏幕旋转90度
    100: [self setSubViewHFrame];
    101: }
    102:
    103: self.frame = frame;
    104: [self.contentView setFrame:self.bounds];
    105: }
    106:
    107: //设置横屏的子视图的frame
    108: - (void)setSubViewHFrame
    109: {
    110: self.textLabel.frame = CGRectMake(30, 0, 1024-60, 20);
    111: }
    112: //设置竖屏的子视图的frame
    113: - (void)setSubViewVFrame
    114: {
    115: self.textLabel.frame = CGRectMake(30, 0, 748-60, 20);
    116: }
    117:
    118: #pragma mark -
    119: #pragma mark 响应屏幕即将旋转时的事件响应
    120: - (void)willRotateScreenEvent:(NSNotification *)notification
    121: {
    122: NSValue *frameValue = [notification.userInfo valueForKey:UIApplicationStatusBarFrameUserInfoKey];
    123: [self rotateStatusBarAnimatedWithFrame:frameValue];
    124: }
    125:
    126: - (void)rotateStatusBarAnimatedWithFrame:(NSValue *)frameValue {
    127: [UIView animateWithDuration:ROTATION_ANIMATION_DURATION animations:^{
    128: self.alpha = 0;
    129: } completion:^(BOOL finished) {
    130: [self rotateStatusBarWithFrame:frameValue];
    131: [UIView animateWithDuration:ROTATION_ANIMATION_DURATION animations:^{
    132: self.alpha = 1;
    133: }];
    134: }];
    135: }
    136:
    137: - (void)dealloc
    138: {
    139: [[NSNotificationCenter defaultCenter] removeObserver:self];
    140: [textLabel release];
    141: textLabel = nil;
    142:
    143: [contentView release];
    144: contentView = nil;
    145:
    146: [super dealloc];
    147: }
    148:
    149: @end
    由于代码比较简单，并且我在上述代码里有相应的注释，这里需要说明一点的是，默认我们继承自UIWindow的StatusBarOverlay类是hidden状态，需要在初始化的时候设置它的hidden属性为NO，
    在屏幕旋转过程中，自定义的状态栏与UIViewController之间的旋转是分离的，所以我们需要做一个隐藏的动画，在旋转过程前先隐藏自定义的状态栏，旋转结果后设置显示状态。
    如果需要做一种动画，比方从底部下移显示一条信息，隔N秒后又自动收回的动画，直接设置自定义的视图的y坐标就可以了，默认y坐标设置是0。
    最后， 使用它的方式也比较简单，只需要初始化，代码：
    StatusBarOverlay *statusBarOverlay = [[StatusBarOverlay alloc] init];
    由于我公司的需求是开机自动下载的功能，所以我在初始化的时候，是放在了AppDelegate中。
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更新时间：2025/5/22 2:54:26