iOS13不允許 valueForKey、setValue: forKey 獲取和設置私有屬性

iOS13以前：

// textField
[_textField setValue:[UIColor orangeColor] forKeyPath:@"_placeholderLabel.textColor"];
// textView
[_textView setValue:創(chuàng)建的label的對象 forKey:@"_placeholderLabel"];

iOS13以后可以修改為：

// 通過 runtime 獲取對象屬性
// instance：textField或者textView對象
// name：屬性名字例如（@"_placeholderLabel"）
Ivar ivar = class_getInstanceVariable(instance.class, name.UTF8String);
UILabel *label = object_getIvar(aTextField, ivar);
// 通過設置label修改

iOS13之后模態(tài)present跳轉(zhuǎn)后頁面沒有充滿屏幕

• 因為iOS13之后默認類型為 UIModalPresentationPageSheet 導致

解決辦法：

設置 modalPresentationStyle 為 UIModalPresentationFullScreen

iOS13之后 deviceToken 獲取方式改變

• 修改方式如下：

NSString *tokenStr = nil;
if (@available(iOS 13.0, *)) {
// 適配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);