全局设置页面颜色 返回按钮样式 iOS

思路

1.建个UIViewController的分类

2.hook方法viewDidLoad（Aspects是三方库 可以不用）

3.看下面蓝色部分代码

#import "UIViewController+TJSwizzling.h"

#import <Aspects.h>

@implementation UIViewController (TJSwizzling)

+ (void)load{

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

[self aspect_hookSelector:@selector(viewDidLoad) withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo> aspectInfo) {

[[aspectInfo instance] swizzling_viewDidLoad];

} error:NULL];

});

}

#pragma mark - ViewDidLoad

- (void)swizzling_viewDidLoad{

//全局设置页面为白色

//  UIInputWindowController 会覆盖每一个控制器，避免为其设置颜色

Class class = NSClassFromString(@"UIInputWindowController");

if (self.class != class) {

self.view.backgroundColor = [UIColor whiteColor];

}

//全局设置返回按钮样式

if (self.navigationController && [self isEqual:self.navigationController.topViewController]) {

UIImage *buttonNormal = [[UIImage imageNamed:@"VideoBar_back"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

[self.navigationController.navigationBar setBackIndicatorImage:buttonNormal];

[self.navigationController.navigationBar setBackIndicatorTransitionMaskImage:buttonNormal];

UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];

self.navigationItem.backBarButtonItem = backItem;

}

}

@end