小编Ben*_*783的帖子

我正在尝试以编程方式构建UI.如何让这个动作起作用？我正在与Swift一起开发.

viewDidLoad中的代码:

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let myFirstLabel = UILabel()
        let myFirstButton = UIButton()
        myFirstLabel.text = "I made a label on the screen #toogood4you"
        myFirstLabel.font = UIFont(name: "MarkerFelt-Thin", size: 45)
        myFirstLabel.textColor = UIColor.redColor()
        myFirstLabel.textAlignment = .Center
        myFirstLabel.numberOfLines = 5
        myFirstLabel.frame = CGRectMake(15, 54, 300, 500)
        myFirstButton.setTitle("?", forState: .Normal)
        myFirstButton.setTitleColor(UIColor.blueColor(), forState: .Normal)
        myFirstButton.frame = CGRectMake(15, -50, 300, 500)
        myFirstButton.addTarget(self, action: "pressed", forControlEvents: .TouchUpInside)
        self.view.addSubview(myFirstLabel)
        self.view.addSubview(myFirstButton)
    }

        func …

我想在Swift中制作一个简单的动画.这是一个淡入淡出.

我试过:

self.myFirstLabel.alpha = 0
self.myFirstButton.alpha = 0
self.mySecondButton.alpha = 0

然后,我有:

self.view.addSubview(myFirstLabel)
self.view.addSubview(myFirstButton)
self.view.addSubview(mySecondButton)

然后:

UIView.animateWithDuration(1.5, animations: {
 self.myFirstLabel.alpha = 1.0
 self.myFirstButton.alpha = 1.0
 self.mySecondButton.alpha = 1.0
})

我在viewDidLoad函数中拥有所有这些.

我该如何工作？

在swift中,我正在将一个对象转换到视图中,我需要它滑入或淡入.如何在我的程序中获得这种类型的动画？

我没有IB(Interface Builder)以编程方式创建了所有视图元素

有文件我可以参考一下吗？我找不到任何东西.

我有一个选择器视图,我希望它中的东西是飞机的尾号.我使用这段代码,但是我得到警告Loop will run once at most, (loop increment never executed),然后我得到control may each end of non-void function.错误这里有什么问题？

码:

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    for (NSInteger i = [[NSUserDefaults standardUserDefaults]integerForKey:@"planeNum"]; (i = 0); i--) {
        NSString *dTailNumber = [NSString stringWithFormat:@"%@", [[NSUserDefaults standardUserDefaults]objectForKey:[NSString stringWithFormat:@"Plane%liTailNumber", i]]];
        return dTailNumber;
    }
}

在Swift中,我有一个包含三个对象的视图.我希望按钮和标签位于图像的顶部.这是一个像Photoshop中的图层一样的概念.目前,图像位于按钮和标签的顶部,因此您无法看到按钮和标签.这是怎么做到的？

我的代码在这里:

import UIKit

    class ViewController: UIViewController {
        override func viewDidLoad() {
            super.viewDidLoad()
            // Do any additional setup after loading the view, typically from a nib.
            let myFirstLabel = UILabel()
            let myFirstButton = UIButton()
            let myFirstImage = UIImage(named: "1792614.jpg")
            let myFirstImageView = UIImageView(image: myFirstImage)

            myFirstLabel.text = "I made a label on the screen #toogood4you"
            myFirstLabel.font = UIFont(name: "MarkerFelt-Thin", size: 45)
            myFirstLabel.textColor = UIColor.redColor()
            myFirstLabel.textAlignment = .Center
            myFirstLabel.numberOfLines = 5
            myFirstLabel.frame = CGRectMake(15, 54, 300, 500)

            myFirstButton.setTitle("?", forState: .Normal)
            myFirstButton.setTitleColor(UIColor.blueColor(), forState: …