在開發(fā)過程中，我們總是遇到這樣那樣的特殊要求，比如在指定頁面展示特殊的樣式，完全異于整個app的風格，為此有很多辦法解決，今天我來記錄其中一種，我們互相學習交流。如有不妥還請指正，如有更好的方案，歡迎交流學習。
一、只改變狀態(tài)欄顏色
1、首先在info.plist設置View controller-based status bar appearance，并將其值設置為YES。
2、在需要修改狀態(tài)欄顏色的頁面重寫系統(tǒng)方法-preferredStatusBarStyle
// 僅當前頁面狀態(tài)欄文字顏色 - 系統(tǒng)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, 默認值
}
}
}
3、手動觸發(fā) preferredStatusBarStyle 更新狀態(tài)欄顏色
如果依賴返回數(shù)據(jù)來決定狀態(tài)欄顏色，可以調(diào)用下面方法手動觸發(fā)preferredStatusBarStyle
// 手動觸發(fā) preferredStatusBarStyle 更新狀態(tài)欄顏色
[self setNeedsStatusBarAppearanceUpdate];
二、同時改變狀態(tài)欄、導航條顏色
1、將要顯示時設置樣式。將要消失時恢復原有樣式。
/// 導航欄背景顏色，準備2個顏色，是應對漸變顏色
@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];
//設置顯示樣式，也可以返回數(shù)據(jù)后調(diào)用此方法，根據(jù)返回數(shù)據(jù)決定顏色
[self updateNavColor:@"#ffffff" second:nil fontColor:@"#000000"];
// 手動觸發(fā) preferredStatusBarStyle 更新狀態(tài)欄顏色
[self setNeedsStatusBarAppearanceUpdate];
}
//頁面消失，還原導航條顏色
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
//恢復webView狀態(tài)欄為白色
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;
}
}
}
/// 更新狀態(tài)欄顏色
- (void)updateStatusBarStyleIsWhite:(BOOL)isWhite{
//修改隱藏導航欄后，狀態(tài)欄顏色還原
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;
}
}
}
/// 配置導航條、文字顏色
/// @param first 第一種顏色，例 白色：#ffffff
/// @param second 第二種顏色，例 黑色：#000000
/// @param fontColor title顏色，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];
}
// 設置導航條背景圖
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：我這里的導航條上的按鈕是自己寫了一下，你用的時候，可以根據(jù)自己的需要適當修改。
2、在需要改變時，調(diào)用-updateNavColor:second:fontColor:方法，改變樣式
[self updateNavColor:self.navColorOne second:self.navColorTwo fontColor:fontColor];
三、 依賴的擴展類：UIImage+GradientColor
UIImage+GradientColor.h
#import <UIKit/UIKit.h>
///漸變方向
typedef NS_ENUM(NSUInteger, GradientType) {
GradientTypeTopToBottom = 0,//從上到小
GradientTypeLeftToRight = 1,//從左到右
GradientTypeUpleftToLowright = 2,//左上到右下
GradientTypeUprightToLowleft = 3,//右上到左下
};
@interface UIImage (GradientColor)
/// 通過一組顏色生成一個漸變色的圖片
+ (UIImage *)gradientColorImageFromColors:(NSArray*)colors gradientType:(GradientType)gradientType imgSize:(CGSize)imgSize;
/// 通過顏色來生成一個純色圖片
+ (UIImage*)imageWithColor:(UIColor*)color;
@end
UIImage+GradientColor.m
#import "UIImage+GradientColor.h"
@implementation UIImage (GradientColor)
/// 通過一組顏色生成一個漸變色的圖片
+ (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); 解決閃退 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;
}
//通過顏色來生成一個純色圖片
+ (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、預覽完成效果：
頁面1
頁面2
頁面3
