ios疯狂详解之自定义状态栏代码解析_0

ios疯狂详解之自定义状态栏代码解析_0 iOS疯狂详解之自定义状态栏代码解析 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:a = 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。