Question

假设您要为UIView添加一些文本。要做到这一点，首先单击一个显示文本字段的按钮。此文本字段可在屏幕上移动，并可放置在任何位置。用户将在该字段中输入文本并单击保存按钮。文本字段消失，并创建UILabel，并在其中输入文本。如果用户希望稍后编辑该文本，他们只需触摸它，UILabel将被删除，文本字段将显示文本内容。我还没有实现标签的触摸方法。

我从哪里开始这样的野兽？

我创建了一个TextView，它将UILabel与其正确的属性一起保存在Array中。它会在数组中运行，而drawRect会将每个标签精确地弹出它所在的位置。

我只是担心我会泄漏记忆，或者说我完全错了。是否有任何人都知道的教程或其他内容可以帮助我指出正确的方向？ TextView应该是UILabel的子类吗？

这是我的TextView.h

@interface TextManager : UIView 

- (void) addTextToView : (NSString *) s : (int)rx :(int) ry;

TextView.m

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
          self.backgroundColor = [UIColor clearColor];
    }
    return self;
}

- (void)drawRect:(CGRect)rect
{
       NSLog(@"Draw Rect Text Manager");
    // Drawing code
    Settings *mySettings = [Settings sharedSettings];

    if ([[mySettings returnTextArray] count] > 0) {
        [self.superview addSubview:[[mySettings returnTextArray] lastObject]];
    }

}

- (void) addTextToView : (NSString *) s : (int)rx :(int) ry {
    NSLog(@"Add Text to View");

    UIColor *tempColor = [UIColor blueColor];
    CGRect  tempRect = CGRectMake(rx, ry, 100, 100);

    UILabel *thisLabel = [[UILabel alloc] initWithFrame:tempRect];
    thisLabel.text = s;
    thisLabel.font = [UIFont fontWithName:@"Helvetica" size:16];
    thisLabel.textColor = tempColor;
    thisLabel.backgroundColor = [UIColor clearColor];
    thisLabel.transform = CGAffineTransformMakeRotation (0);
    thisLabel.userInteractionEnabled = NO;
    thisLabel.tag = 1;

    [textArray addObject:thisLabel];

    [self setNeedsDisplay];
}

Answer 1

您不需要交换标签和文本字段以获得所需的结果。在UITextField：

中使用一个UIView

@interface CSTextView : UIView

@property (nonatomic, strong) UITextField *textField;

@end

@implementation CSTextView

- (id)initWithFrame:(CGRect)frame
{
    if ((self = [super initWithFrame:frame])) {
        UITextField *textField = [[UITextField alloc] initWithFrame:[self bounds]];

        textField.placeholder = @"Your text here";
        textField.font = [UIFont fontWithName:@"Helvetica" size:16];
        textField.textColor = [UIColor redColor];
        textField.backgroundColor = [UIColor clearColor];
        textField.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
        textField.textAlignment = NSTextAlignmentCenter;
        textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;

        [self setTextField:textField];
        [self addSubview:textField];
    }
    return self;
}

@end

然后，在视图控制器中，实现UITextFieldDelegate协议并在文本视图中添加手势识别器来处理拖动，如下所示：

@interface CSViewController : UIViewController <UITextFieldDelegate>

@property (nonatomic, strong) UIView *textView;

@end

@implementation CSViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    CSTextView *textView = [[CSTextView alloc] initWithFrame:CGRectMake(20, 100, 280, 60)];

    [textView setBackgroundColor:[UIColor colorWithWhite:0 alpha:0.1]];
    [[textView textField] setDelegate:self];

    [textView addGestureRecognizer:[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)]];

    [self setTextView:textView];
    [[self view] addSubview:textView];
}

#pragma mark -
#pragma mark Gesture recognizer

- (void)handlePan:(UIPanGestureRecognizer *)panRecognizer
{
    CGPoint translation = [panRecognizer translationInView:[self view]];

    if ([panRecognizer state] == UIGestureRecognizerStateChanged) {
        [[self textView] setFrame:CGRectOffset([[self textView] frame], translation.x, translation.y)];
    }

    [panRecognizer setTranslation:CGPointZero inView:[self view]];
}

#pragma mark -
#pragma mark Text field methods

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];

    return YES;
}

@end

动态添加UILabel到UIView然后编辑

1 个答案: