iOS13的一些适配

iOS13不允许 valueForKey、setValue: forKey 获取和设置私有属性

iOS13以前：

// textField
[_textField setValue:[UIColor orangeColor] forKeyPath:@"_placeholderLabel.textColor"];
// textView
[_textView setValue:创建的label的对象 forKey:@"_placeholderLabel"];

iOS13以后可以修改为：

// 通过 runtime 获取对象属性
// instance：textField或者textView对象
// name：属性名字例如（@"_placeholderLabel"）
Ivar ivar = class_getInstanceVariable(instance.class, name.UTF8String);
UILabel *label = object_getIvar(aTextField, ivar);
// 通过设置label修改

iOS13之后模态present跳转后页面没有充满屏幕

• 因为iOS13之后默认类型为 UIModalPresentationPageSheet 导致

解决办法：

设置 modalPresentationStyle 为 UIModalPresentationFullScreen

iOS13之后 deviceToken 获取方式改变

• 修改方式如下：

NSString *tokenStr = nil;
if (@available(iOS 13.0, *)) {
// 适配iOS13
        NSMutableString *deviceStr = [NSMutableString string];
        const char *bytes = deviceToken.bytes;
        NSInteger count = deviceToken.length;
        for (int i = 0; i < count; i++) {
            [deviceStr appendFormat:@"%02x", bytes[i]&0x000000FF];
        }
        tokenStr = deviceStr;
    }else {
// iOS13以前
        NSString *deviceStr = [deviceToken description];
        if ((deviceStr.length > 0) && ([deviceStr rangeOfString:@"<"].location != NSNotFound)) {
            NSString *tk0 = [deviceStr stringByReplacingOccurrencesOfString:@"<"withString:@""];
            NSString *tk1 = [tk0 stringByReplacingOccurrencesOfString:@">"withString:@""];
            tokenStr = [tk1 stringByReplacingOccurrencesOfString:@" "withString:@""];
        }
    }
NSLog(@"%@",tokenStr);