Customize the Look of an UIAlertView

[Biacho]

Hello,

Somebody was doing something like this ? I mean completely change UIAlertView design ? 

I need to change this look for my App but Google doesn't want help me in this case.

Plz help... 

[Nielson Rolim]

Hi Biacho,

I found this class, but I don't remember where... You can custom the UIAlertView, change the borders, the background, etc.

I'm using it to display a RED alert view instead of the default blue one.

#import <UIKit/UIKit.h>

@interface CustomAlert : UIAlertView

+ (void) setBackgroundColor:(UIColor *) background 

            withStrokeColor:(UIColor *) stroke;

@end

#import "CustomAlert.h"

@interface CustomAlert (Private)

- (void) drawRoundedRect:(CGRect) rect inContext:(CGContextRef) 

context withRadius:(CGFloat) radius;

@end

static UIColor *fillColor = nil;

static UIColor *borderColor = nil;

@implementation CustomAlert

+ (void) setBackgroundColor:(UIColor *) background 

            withStrokeColor:(UIColor *) stroke

{

if(fillColor != nil)

{

fillColor = nil;

borderColor = nil;

}

    

fillColor = background;

borderColor = stroke;

}

- (id)initWithFrame:(CGRect)frame

{

    if((self = [super initWithFrame:frame]))

{

        if(fillColor == nil)

{

fillColor = [UIColor blackColor];

borderColor = [UIColor colorWithHue:0.625 

                                      saturation:0.0 brightness:0.8 alpha:0.8];

}

    }

    

    return self;

}

- (void)layoutSubviews

{

for (UIView *sub in [self subviews])

{

if([sub class] == [UIImageView class] && sub.tag == 0)

{

// The alert background UIImageView tag is 0, 

// if you are adding your own UIImageView's 

// make sure your tags != 0 or this fix 

// will remove your UIImageView's as well!

[sub removeFromSuperview];

break;

}

}

}

- (void)drawRect:(CGRect)rect

{

CGContextRef context = UIGraphicsGetCurrentContext();

    

CGContextClearRect(context, rect);

CGContextSetAllowsAntialiasing(context, true);

CGContextSetLineWidth(context, 0.0);

CGContextSetAlpha(context, 0.8); 

CGContextSetLineWidth(context, 2.0);

CGContextSetStrokeColorWithColor(context, [borderColor CGColor]);

CGContextSetFillColorWithColor(context, [fillColor CGColor]);

    

// Draw background

CGFloat backOffset = 2;

CGRect backRect = CGRectMake(rect.origin.x + backOffset, 

                                 rect.origin.y + backOffset, 

                                 rect.size.width - backOffset*2, 

                                 rect.size.height - backOffset*2);

    

[self drawRoundedRect:backRect inContext:context withRadius:8];

CGContextDrawPath(context, kCGPathFillStroke);

    

// Clip Context

CGRect clipRect = CGRectMake(backRect.origin.x + backOffset-1, 

                                 backRect.origin.y + backOffset-1, 

                                 backRect.size.width - (backOffset-1)*2, 

                                 backRect.size.height - (backOffset-1)*2);

    

[self drawRoundedRect:clipRect inContext:context withRadius:8];

CGContextClip (context);

    

//Draw highlight

CGGradientRef glossGradient;

CGColorSpaceRef rgbColorspace;

size_t num_locations = 2;

CGFloat locations[2] = { 0.0, 1.0 };

CGFloat components[8] = { 1.0, 1.0, 1.0, 0.35, 1.0, 1.0, 1.0, 0.06 };

rgbColorspace = CGColorSpaceCreateDeviceRGB();

glossGradient = CGGradientCreateWithColorComponents(rgbColorspace, 

                                                        components, locations, num_locations);

    

CGRect ovalRect = CGRectMake(-130, -115, (rect.size.width*2), 

                                 rect.size.width/2);

    

CGPoint start = CGPointMake(rect.origin.x, rect.origin.y);

CGPoint end = CGPointMake(rect.origin.x, rect.size.height/5);

    

CGContextSetAlpha(context, 1.0); 

CGContextAddEllipseInRect(context, ovalRect);

CGContextClip (context);

    

CGContextDrawLinearGradient(context, glossGradient, start, end, 0);

    

CGGradientRelease(glossGradient);

CGColorSpaceRelease(rgbColorspace); 

}

- (void) drawRoundedRect:(CGRect) rrect inContext:(CGContextRef) context 

              withRadius:(CGFloat) radius

{

CGContextBeginPath (context);

    

CGFloat minx = CGRectGetMinX(rrect), midx = CGRectGetMidX(rrect), 

    maxx = CGRectGetMaxX(rrect);

    

CGFloat miny = CGRectGetMinY(rrect), midy = CGRectGetMidY(rrect), 

    maxy = CGRectGetMaxY(rrect);

    

CGContextMoveToPoint(context, minx, midy);

CGContextAddArcToPoint(context, minx, miny, midx, miny, radius);

CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius);

CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius);

CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius);

CGContextClosePath(context);

}

@end

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