iOS 修改状态栏、导航条颜色及文字颜色

在开发过程中，我们总是遇到这样那样的特殊要求，比如在指定页面展示特殊的样式，完全异于整个app的风格，为此有很多办法解决，今天我来记录其中一种，我们互相学习交流。如有不妥还请指正，如有更好的方案，欢迎交流学习。

一、只改变状态栏颜色

1、首先在info.plist设置View controller-based status bar appearance，并将其值设置为YES。

2、在需要修改状态栏颜色的页面重写系统方法-preferredStatusBarStyle

// 仅当前页面状态栏文字颜色 - 系统方法
- (UIStatusBarStyle)preferredStatusBarStyle {
    if (self.isLightStyle) {
        // 白色
        return UIStatusBarStyleLightContent;
    }else{
        // 黑色
        if (@available(iOS 13.0, *)) {
            return UIStatusBarStyleDarkContent;
        } else {
            return UIStatusBarStyleDefault; //黑色, 默认值
        }
    }
}

3、手动触发 preferredStatusBarStyle 更新状态栏颜色

如果依赖返回数据来决定状态栏颜色，可以调用下面方法手动触发preferredStatusBarStyle

// 手动触发 preferredStatusBarStyle 更新状态栏颜色
[self setNeedsStatusBarAppearanceUpdate];

---

二、同时改变状态栏、导航条颜色

1、将要显示时设置样式。将要消失时恢复原有样式。

/// 导航栏背景颜色，准备2个颜色，是应对渐变颜色
@interface ZBWebViewVC ()
@property (nonatomic, copy) NSString *navColorOne;
@property (nonatomic, copy) NSString *navColorTwo;

@property (nonatomic, strong) UIView *statusBar;
@property (nonatomic, assign) BOOL isLightStyle;
@end


@implementation ZBWebViewVC

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    //设置显示样式，也可以返回数据后调用此方法，根据返回数据决定颜色
    [self updateNavColor:@"#ffffff" second:nil fontColor:@"#000000"];
    // 手动触发 preferredStatusBarStyle 更新状态栏颜色
	[self setNeedsStatusBarAppearanceUpdate];
}

//页面消失，还原导航条颜色
- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];

    //恢复webView状态栏为白色
    if (@available(iOS 13.0, *)) {
        if ([[UIApplication sharedApplication].keyWindow.subviews containsObject:self.statusBar]) {
            [self.statusBar removeFromSuperview];
        }
    } else {
        UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
        if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) {
            statusBar.backgroundColor = UIColor.clearColor;
        }
    }
}

/// 更新状态栏颜色
- (void)updateStatusBarStyleIsWhite:(BOOL)isWhite{
    //修改隐藏导航栏后，状态栏颜色还原
    UIColor *bgColor = UIColor.whiteColor;
    if (self.navColorOne.length && !isWhite) {
        bgColor = [UIColor colorWithHexString:self.navColorOne];
    }
    if (@available(iOS 13.0, *)) {
        if (![[UIApplication sharedApplication].keyWindow.subviews containsObject:self.statusBar]) {
            [[UIApplication sharedApplication].keyWindow addSubview:self.statusBar];
        }
        self.statusBar.backgroundColor = bgColor;
    } else {
        UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];
        if ([statusBar respondsToSelector:@selector(setBackgroundColor:)]) {
            statusBar.backgroundColor = bgColor;
        }
    }
}

/// 配置导航条、文字颜色
/// @param first 第一种颜色，例 白色：#ffffff
/// @param second 第二种颜色，例 黑色：#000000
/// @param fontColor title颜色，例 黑色：#000000
- (void)updateNavColor:(NSString *)first second:(NSString *)second fontColor:(NSString *)fontColor{
    UIColor *topleftColor = [UIColor colorWithHexString:first];
    UIColor *bottomrightColor = second ? [UIColor colorWithHexString:second] : topleftColor;
    UIColor *fColor;
    
    if (self.isLightStyle) {
        [self.btnLeftOne setImage:[UIImage imageNamed:@"nav_back_white"] forState:UIControlStateNormal];
        [self.btnLeftTwo setImage:[UIImage imageNamed:@"nav_close_white"] forState:UIControlStateNormal];
        
        [self.btnRightOne setImage:[UIImage imageNamed:@"caigoudannew_white"] forState:UIControlStateNormal];
        [self.btnRightTwo setImage:[UIImage imageNamed:@"share_white"] forState:UIControlStateNormal];
        
        fColor = fontColor ? [UIColor colorWithHexString:fontColor] : UIColor.whiteColor;
        [self updateStatusBarStyleIsWhite:NO];
    }else{
        [self.btnLeftOne setImage:[UIImage imageNamed:@"nav_back_black"] forState:UIControlStateNormal];
        [self.btnLeftTwo setImage:[UIImage imageNamed:@"nav_close_black"] forState:UIControlStateNormal];
        
        [self.btnRightOne setImage:[UIImage imageNamed:@"caigoudannew"] forState:UIControlStateNormal];
        [self.btnRightTwo setImage:[UIImage imageNamed:@"share_black"] forState:UIControlStateNormal];
        
        fColor = fontColor ? [UIColor colorWithHexString:fontColor] : UIColor.blackColor;
        [self updateStatusBarStyleIsWhite:YES];
    }
    
    // 设置导航条背景图
    UIImage *bgImg = [UIImage gradientColorImageFromColors:@[topleftColor, bottomrightColor] gradientType:GradientTypeLeftToRight imgSize:CGSizeMake(XYYScreenW, kNavBarHeight)];
    if (@available(iOS 13.0, *)) {
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
        [appearance configureWithOpaqueBackground];
        appearance.backgroundImage = bgImg;
        appearance.titleTextAttributes = @{NSForegroundColorAttributeName:fColor, NSFontAttributeName:[UIFont systemFontOfSize:17]};
        self.navigationController.navigationBar.standardAppearance = appearance;
        self.navigationController.navigationBar.scrollEdgeAppearance = appearance;
    }else{
        self.navigationController.navigationBar.titleTextAttributes =
        @{NSForegroundColorAttributeName:fColor, NSFontAttributeName:[UIFont systemFontOfSize:17]};
    }
    [self.navigationController.navigationBar setBackgroundImage:bgImg forBarMetrics:UIBarMetricsDefault];
}

#pragma mark - lazy
- (UIView *)statusBar{
    if (!_statusBar) {
        if (@available(iOS 13.0, *)) {
            _statusBar = [[UIView alloc] initWithFrame:[UIApplication sharedApplication].keyWindow.windowScene.statusBarManager.statusBarFrame];
        }
    }
    return _statusBar;
}

注：我这里的导航条上的按钮是自己写了一下，你用的时候，可以根据自己的需要适当修改。

2、在需要改变时，调用-updateNavColor:second:fontColor:方法，改变样式

[self updateNavColor:self.navColorOne second:self.navColorTwo fontColor:fontColor];

---

三、 依赖的扩展类：UIImage+GradientColor

UIImage+GradientColor.h

#import <UIKit/UIKit.h>

///渐变方向
typedef NS_ENUM(NSUInteger, GradientType) {
    GradientTypeTopToBottom = 0,//从上到小
    GradientTypeLeftToRight = 1,//从左到右
    GradientTypeUpleftToLowright = 2,//左上到右下
    GradientTypeUprightToLowleft = 3,//右上到左下
};

@interface UIImage (GradientColor)
/// 通过一组颜色生成一个渐变色的图片
+ (UIImage *)gradientColorImageFromColors:(NSArray*)colors gradientType:(GradientType)gradientType imgSize:(CGSize)imgSize;

/// 通过颜色来生成一个纯色图片
+ (UIImage*)imageWithColor:(UIColor*)color;

@end

UIImage+GradientColor.m

#import "UIImage+GradientColor.h"

@implementation UIImage (GradientColor)
/// 通过一组颜色生成一个渐变色的图片
+ (UIImage *)gradientColorImageFromColors:(NSArray*)colors gradientType:(GradientType)gradientType imgSize:(CGSize)imgSize {
    if (colors.count == 0) {
        return nil;
    }
    NSMutableArray *ar = [NSMutableArray array];
    for(UIColor *c in colors) {
        [ar addObject:(id)c.CGColor];
    }
    UIGraphicsBeginImageContextWithOptions(imgSize, YES, 1);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);
    CGColorSpaceRef colorSpace = CGColorGetColorSpace([[colors lastObject] CGColor]);
    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)ar, NULL);
    CGPoint start;
    CGPoint end;
    switch (gradientType) {
        case GradientTypeTopToBottom:
            start = CGPointMake(0.0, 0.0);
            end = CGPointMake(0.0, imgSize.height);
            break;
        case GradientTypeLeftToRight:
            start = CGPointMake(0.0, 0.0);
            end = CGPointMake(imgSize.width, 0.0);
            break;
        case GradientTypeUpleftToLowright:
            start = CGPointMake(0.0, 0.0);
            end = CGPointMake(imgSize.width, imgSize.height);
            break;
        case GradientTypeUprightToLowleft:
            start = CGPointMake(imgSize.width, 0.0);
            end = CGPointMake(0.0, imgSize.height);
            break;
        default:
            break;
    }
    CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    CGGradientRelease(gradient);
    CGContextRestoreGState(context);
//    CGColorSpaceRelease(colorSpace); 解决闪退 Assertion failed: (!space->is_singleton), function color_space_dealloc, file /BuildRoot/Library/Caches/com.apple.xbs/Sources/Quartz2D/Quartz2D-1033.1/CoreGraphics/ColorSpaces/color-space.c, line 102.
    UIGraphicsEndImageContext();
    return image;
}

//通过颜色来生成一个纯色图片
+ (UIImage*)imageWithColor:(UIColor*)color{
    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

@end

四、预览完成效果：