1.深夜模式（之后适配了再更新）
如果不想适配深夜模式，在info.plist上添加UIUserInterfaceStyle，并且设置为Light即可
2.蓝牙权限
使用到蓝牙，需要在info.plist上声明蓝牙权限使用，之前是只需要添加NSBluetoothPeripheralUsageDescription，iOS13之后需要添加NSBluetoothAlwaysUsageDescription
3.获取Wi-Fi名
iOS 12之前：
id info = nil;
NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
for (NSString *ifnam in ifs) {
info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
NSString *str = info[@"SSID"];//name
}
iOS 12之后以上方法获取不到，需要在Xcode中TARGET-->Capabilities打开Access WiFi Information选项
1A9BB7FD-1FC9-4EBA-BD0A-7438F3F86624.png
iOS 13之后以上方法获取Wi-Fi名返回的都是固定值"WLAN"，这里可能是因为苹果保护用户隐私而产生的问题，因为通过wifi信息可以定位到用户地理位置。所以iOS13以后如果想要继续获取WiFi名称，需要在调用接口前判断用户是否同意App使用地理位置信息。可以在程序一启动时请求用户权限，调用的方法如下：
#import
@property (strong, nonatomic) CLLocationManager *locationManager;
NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];
CGFloat version = [phoneVersion floatValue];
// 如果是iOS13 未开启地理位置权限 需要提示一下
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined && version >= 13) {
self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager requestWhenInUseAuthorization];
}
如果用户拒绝了授权，在需要获取Wi-Fi名的界面加上提示：
NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];
CGFloat version = [phoneVersion floatValue];
//如果开启地理位置权限未开启 需要提示一下
if (([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined || [CLLocationManager authorizationStatus] == kCLAuthorizationStatusRestricted || [CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied )&& version >= 13) {
[PracticalTools showAlertViewWithTitle:@"提示" message:@"您的位置权限尚未授权，将无法获取当前Wi-Fi进行配置网络，请前往“设置”-“****App”-“位置”进行授权！" doneText:@"确定" cancelText:nil doneHandle:nil cancelHandle:nil vc:self];
}
4.Tabbar字体选中颜色在push后返回时被修改成系统蓝色
iOS13之前使用的是
+ (void)load{
UITabBarItem * item = [UITabBarItem appearance];
NSMutableDictionary *dictSel = [[NSMutableDictionary alloc]init];
dictSel[NSForegroundColorAttributeName] = [UIColor colorWithHexString:@"f76710"];
[item setTitleTextAttributes:dictSel forState:UIControlStateSelected];
NSMutableDictionary *dictNor = [[NSMutableDictionary alloc]init];
dictNor[NSFontAttributeName] = [UIFont systemFontOfSize:11];
dictNor[NSForegroundColorAttributeName] = [UIColor colorWithHexString:@"909090"];
[item setTitleTextAttributes:dictNor forState:UIControlStateNormal];
}
这方法在iOS13界面初始化的时候是可以的，但是当界面push之后，返回来时会被修改成系统的默认蓝色，iOS13修改成即可：
- (void)viewDidLoad {
[super viewDidLoad];
[self prepareSubChildVC];
self.delegate = self;
if (@available(iOS 13.0,*)) {
self.tabBar.tintColor = [UIColor colorWithHexString:@"f76710"];//选中颜色
// 全局默认颜色
// [[UITabBar appearance] setUnselectedItemTintColor:[UIColor colorWithHexString:@"f76710"]];
}
}
5.UITextField使用kvc修改placeholder字体大小颜色crash
iOS 13禁止使用kvc修改私有属性，之前一直使用kvc修改UITextField的palceholder，但是iOS13直接崩溃
//iOS13禁止使用kvc修改
+ (void)setDifferentFontForPlaceholderInTextField:(UITextField *)textField withFont:(UIFont *)font andColor:(UIColor *)textColor{
if ([UIDevice currentDevice].systemVersion.floatValue < 13.0) {
[textField setValue:textColor forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:font forKeyPath:@"_placeholderLabel.font"];
}
}
修改为：
+ (void)setDifferentFontForPlaceholderInTextField:(UITextField *)textField withFont:(UIFont *)font andColor:(UIColor *)textColor andPlaceholderText:(NSString *)placeholder{
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:placeholder attributes:@{NSForegroundColorAttributeName:textColor,NSFontAttributeName:font}];
textField.attributedPlaceholder = attrString;
}
6.UISearchBar删除黑线crash
iOS 13之前都是遍历后移除UISearchBarBackground，但是iOS13之后会导致渲染失败而崩溃，解决方法是修改UISearchBarBackground.layer.contents为nil
+ (void)searchBarDeleteBackgroundLine:(UISearchBar*)searchBar{
for (UIView *obj in [searchBar subviews]) {
for (UIView *objs in [obj subviews]) {
if ([objs isKindOfClass:NSClassFromString(@"UISearchBarBackground")]){
if (@available(iOS 13.0,*)) {
objs.backgroundColor = [UIColor whiteColor];
objs.layer.contents = nil;
}else{
[objs removeFromSuperview];
}
}
}
if ([obj isKindOfClass:NSClassFromString(@"UISearchBarBackground")]){
if (@available(iOS 13.0,*)) {
obj.backgroundColor = [UIColor whiteColor];
obj.layer.contents = nil;
}else{
[obj removeFromSuperview];
}
}
}
}
7.模态视图变成分页形式
在iOS 13之前，模态视图默认都是全屏的，而在iOS13中，默认的样式变成了类iPhone上safari的分页样式，只需要修改modalPresentationStyle为UIModalPresentationFullScreen即可
LoginVC *vc = [[LoginVC alloc]init];
vc.delegate = self;
vc.view.backgroundColor = [UIColor whiteColor];
MainNavigationController *navVC = [[MainNavigationController alloc]initWithRootViewController:vc];
navVC.modalPresentationStyle = UIModalPresentationFullScreen;
[self presentViewController:navVC animated:YES completion:nil];
8.使用CryptLib加密失败
iOS13之前使用都正常，在iOS13加密后的字符串是错误的，在https://stackoverflow.com/questions/58098958/aes-encryption-cryptlib-in-ios-13-not-working找到了问题所在及解决方法
错误地方：
NSString *hash = [out description];
解决方法：
/**
* This function computes the SHA256 hash of input string
* @param key input text whose SHA256 hash has to be computed
* @param length length of the text to be returned
* @return returns SHA256 hash of input text
*/
- (NSString*) sha256:(NSString *)key length:(NSInteger) length{
const char *s=[key cStringUsingEncoding:NSASCIIStringEncoding];
NSData *keyData=[NSData dataWithBytes:s length:strlen(s)];
uint8_t digest[CC_SHA256_DIGEST_LENGTH]={0};
CC_SHA256(keyData.bytes, (CC_LONG)keyData.length, digest);
NSData *out=[NSData dataWithBytes:digest length:CC_SHA256_DIGEST_LENGTH];
// NSString *hash=[out description];//iOS13 Error
NSString *hash = [self hex:out];
hash = [hash stringByReplacingOccurrencesOfString:@" " withString:@""];
hash = [hash stringByReplacingOccurrencesOfString:@"<" withString:@""];
hash = [hash stringByReplacingOccurrencesOfString:@">" withString:@""];
if(length > [hash length])
{
return hash;
}
else
{
return [hash substringToIndex:length];
}
}
#pragma mark - String Conversion
-(NSString*)hex:(NSData*)data{
NSMutableData *result = [NSMutableData dataWithLength:2*data.length];
unsigned const char* src = data.bytes;
unsigned char* dst = result.mutableBytes;
unsigned char t0, t1;
for (int i = 0; i < data.length; i ++ ) {
t0 = src[i] >> 4;
t1 = src[i] & 0x0F;
dst[i*2] = 48 + t0 + (t0 / 10) * 39;
dst[i*2+1] = 48 + t1 + (t1 / 10) * 39;
}
return [[NSString alloc] initWithData:result encoding:NSASCIIStringEncoding];
}