IOS – can stretch a UIImageView but not a UIButton

iosuibuttonuiimageviewuiview

Behold:

//UIImageView* stretchTest = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image.png"]];
//[self addSubview:stretchTest];


UIButton *stretchTest = [UIButton buttonWithType:UIButtonTypeCustom];
[stretchTest setFrame:CGRectMake(0, 0, 400, 100)];
[stretchTest setBackgroundImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
[self addSubview:stretchTest];

stretchTest.contentStretch = CGRectMake(0.5, 0.5, 0, 0);
stretchTest.contentMode = UIViewContentModeScaleToFill;

CGRect frame = stretchTest.frame;
frame.size.height = 300;
stretchTest.frame = frame;

Using the UIImageView (commented out above), the image stretches appropriately – rounded corners maintain the correct radius, because only the center pixel of the image gets stretched.

Using the UIButton, the image gets stretched incorrectly. The corner radii are not maintained and it gets ugly.

Both UIImageView and UIButton are subclasses of UIView. Why does the button resize differently than the imageView?

Best Answer

You're making assumptions about the way UIButton works. It's not implemented the same way as UIImageView. UIImageView is just a view, with no subviews, and its contents is the image. UIButton is different, and the way it works is a private implementation detail.

If you're trying to stretch an image appropriately on a button, you should use -[UIImage stretchableImageWithLeftCapWidth:topCapHeight:] to get a UIImage that knows how it should be stretched. If you want to stretch just the middle pixel, you can use something like

UIImage *image = [UIImage imageNamed:@"image.png"];
image = [image stretchableImageWithLeftCapWidth:floorf(image.size.width/2) topCapHeight:floorf(image.size.height/2)];

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IPhone: Image View picture size limit

The reason why your app crashed is because the picture you are using is too big.
According to the class reference for UIImage, it says that You should avoid creating UIImage objects that are greater than 1024 x 1024 in size.

If you add a UIImage object which has a bigger image than 1024 x 1024 to a UIImageView object, your app could crash. If you are lucky, sometimes your app doesn't crash though.

Php – Laravel : random error : SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected

According config/database.php and .env file that You show us everything is ok.

SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected

this means that database is not selected,
seems like have problem with existence of database, or DB_NAME does not get in config database param.

There is some steps You've to check:

1) Check Your config/database.php file contents to have such content:

<?php

return [

    'fetch' => PDO::FETCH_CLASS,

    'default' => 'mysql',

    'connections' => [

        'mysql' => [
            'driver' => 'mysql', 
            'host' => env('DB_HOST'),         
            'database' => env('DB_DATABASE'), 
            'username' => env('DB_USERNAME'), 
            'password' => env('DB_PASSWORD'), 
            'charset' => 'utf8', 
            'collation' => 'utf8_unicode_ci', 
            'prefix' => '', 
            'strict' => false
        ],

        'mysql2' => [
            'driver' => 'mysql', 
            'host' => env('DB_HOST_ACADEMY'), 
            'database' => env('DB_DATABASE_ACADEMY'), 
            'username' => env('DB_USERNAME_ACADEMY'), 
            'password' => env('DB_PASSWORD_ACADEMY'), 
            'charset' => 'utf8', 
            'collation' => 'utf8_unicode_ci', 
            'prefix' => '', 
            'strict' => false
        ],

        'mysql3' => [
            'driver' => 'mysql', 
            'host' => env('DB_HOST_ACADEMY'), 
            'database' => env('DB_DATABASE_ACADEMY_DATE'), 
            'username' => env('DB_USERNAME_ACADEMY'), 
            'password' => env('DB_PASSWORD_ACADEMY'), 
            'charset' => 'utf8', 
            'collation' => 'utf8_unicode_ci', 
            'prefix' => '', 
            'strict' => false
        ]
    ],

    'migrations' => 'migrations',

    'redis' => [
        'cluster' => false,
        'default' => [
            'host' => '127.0.0.1', 
            'port' => 6379, 
            'database' => 0
        ]
    ]
];

2) Check Your .env file exist in Your app root and it's not .env.example

3) Check .env file to have this line, if Yes so delete and copy-paste it from here (maybe spelling issue):

DB_DATABASE=gestion-inscriptions-v2

p.s. because of in Your question files are correct need more debug info, screenshot and etc. to see that problem is not with .env or file system (maybe .env file cannot be read).

Best Answer

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IPhone: Image View picture size limit

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