iOS 13 - UITextField with Placeholder getting app crash

I think it's a bug from the XCode side and hopefully, they will fix this one on the next release. You can quickly fix this by Erase all Contents and Settings on the Simulator device.

You can do it by using runtime:

add the following code to the bottom of placeholder setting

Ivar ivar =  class_getInstanceVariable([UITextField class], "_placeholderLabel");
UILabel *placeholderLabel = object_getIvar(textField, ivar);
placeholderLabel.textColor = [UIColor whiteColor];

At Xcode 11 beta2 ,this code is work ,but I don't know about GM version or official version.

The complete code:

• Objective-C Version

#import "ViewController.h"
#import <objc/runtime.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor grayColor];
    self.title = @"UITextField Demo";

    UITextField *textField = [UITextField new];
    textField.frame = CGRectMake(0, 100, 300, 50);
    textField.placeholder = @"UITextField Demo";
    [self.view addSubview:textField];

    Ivar ivar =  class_getInstanceVariable([UITextField class], "_placeholderLabel");
    UILabel *placeholderLabel = object_getIvar(textField, ivar);

    placeholderLabel.textColor = [UIColor whiteColor];
}

@end

• Swift Version:

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        let textField = UITextField()
        textField.frame = CGRect(x: 0, y: 100, width: 300, height: 50)
        textField.placeholder = "UITextField Demo"
        view.addSubview(textField)

        let iVar = class_getInstanceVariable(UITextField.self, "_placeholderLabel")!
        let placeholderLabel = object_getIvar(textField, iVar) as! UILabel
        placeholderLabel.textColor = .red
    }
}

2019/09/25 Update

The above implementation can solve the problem ,but it not be advocated.

The apps that use the private api maybe broken in the future.

Please use new api :

var attributedPlaceholder: NSAttributedString? { get set }

Discussion

This property is nil by default. If set, the placeholder string is drawn using system-defined color and the remaining style information (except the text color) of the attributed string. Assigning a new value to this property also replaces the value of the placeholder property with the same string data, albeit without any formatting information. Assigning a new value to this property does not affect any other style-related properties of the text field.

The complete code:

let textField = UITextField()
textField.frame = CGRect(x: 0, y: 100, width: 300, height: 50)
let placeholderString = NSAttributedString.init(string: "UITextField Demo", attributes: [NSAttributedString.Key.foregroundColor : UIColor.red])
textField.attributedPlaceholder = placeholderString
view.addSubview(textField)