Question

您好我有一个alertview，我想通过cgrectmake属性更改大小，但它不会发生。它只取默认大小。

我尝试了以下代码。

- (void)viewDidLoad {
[super viewDidLoad];
UIAlertView* find = [[[UIAlertView alloc] init]initWithFrame:CGRectMake(0,0,300,200)];
[find setDelegate:self];
[find setTitle:@"Sample Alert"];
[find setNeedsLayout];
[find show];
[find release];

}

提前致谢。

Answer 1

要在您的代码中实现您想要的目标，请执行以下操作：

[find show];

添加：

find.frame = CGRectMake(0,0,300,200);

但它并不漂亮，我建议你使用ActionSheets。

Answer 2

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Confirmation" message:@" Submit the answer " delegate:self cancelButtonTitle:@"NO" otherButtonTitles:@"YES", nil];
[alert show];
[alert release];

UILabel *theTitle = [alert valueForKey:@"_titleLabel"];
[theTitle setTextColor:[UIColor blackColor]];

UILabel *theBody = [alert valueForKey:@"_bodyTextLabel"];
[theBody setTextColor:[UIColor blackColor]];

UIImage *theImage = [UIImage imageNamed:@"blue-white-abstract-background.jpg"];    
theImage = [theImage stretchableImageWithLeftCapWidth:10 topCapHeight:10];
CGSize theSize = [alert frame].size;

UIGraphicsBeginImageContext(theSize);    
[theImage drawInRect:CGRectMake(0, 0, theSize.width, theSize.height)];    
theImage = UIGraphicsGetImageFromCurrentImageContext();    
UIGraphicsEndImageContext();

//[[alert layer] setContents:[theImage CGImage]];
[[alert layer] setContents:[UIColor clearColor]];

此代码为alertview做了很多工作，并对其进行修改以增加警报视图的大小。

Answer 3

这可以很好地完成工作，并且当警报出现时看起来并不奇怪（ahmet emrah解决方案有非常糟糕的副作用）。

CGAffineTransform myTransform = CGAffineTransformMakeScale(1.0, 0.5f);
[alert setTransform:myTransform];

Answer 4

您可以继承UIAlertView。我做过类似的事情，根据你的需要改变它。

标题文件，

#import <Foundation/Foundation.h>

/* An alert view with a textfield to input text.  */
@interface AlertPrompt : UIAlertView    
{
    UITextField *textField;
}

@property (nonatomic, retain) UITextField *textField;
@property (readonly) NSString *enteredText;

- (id)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle okButtonTitle:(NSString *)okButtonTitle;

@end

源代码，

#import "AlertPrompt.h"


@implementation AlertPrompt

static const float kTextFieldHeight     = 25.0;
static const float kTextFieldWidth      = 100.0;

@synthesize textField;
@synthesize enteredText;

- (void) drawRect:(CGRect)rect {
    [super drawRect:rect];

    CGRect labelFrame;
    NSArray *views = [self subviews];
    for (UIView *view in views){
        if ([view isKindOfClass:[UILabel class]]) {
            labelFrame = view.frame;
        } else {    
            view.frame = CGRectMake(view.frame.origin.x, view.frame.origin.y + kTextFieldHeight , view.frame.size.width, view.frame.size.height);
        }

    }

    CGRect myFrame = self.frame;
    self.textField.frame = CGRectMake(95, labelFrame.origin.y+labelFrame.size.height + 5.0, kTextFieldWidth, kTextFieldHeight);
    self.frame = CGRectMake(myFrame.origin.x, myFrame.origin.y, myFrame.size.width, myFrame.size.height + kTextFieldHeight);

}

- (id)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle okButtonTitle:(NSString *)okayButtonTitle
{

    if (self = [super initWithTitle:title message:message delegate:delegate cancelButtonTitle:cancelButtonTitle otherButtonTitles:okayButtonTitle, nil])
    {
        // add the text field here, so that customizable from outside. But set the frame in drawRect. 
        self.textField = [[UITextField alloc] init];
        [self.textField setBackgroundColor:[UIColor whiteColor]]; 
        [self addSubview: self.textField];

       // CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 20.0); 
      //  [self setTransform:translate];
    }
    return self;
}
- (void)show
{
    [textField becomeFirstResponder];
    [super show];
}
- (NSString *)enteredText
{
    return textField.text;
}
- (void)dealloc
{
    [textField release];
    [super dealloc];
}
@end

改变uialertview大小的问题

4 个答案: