完美兼容iOS7自定义的AlertView

在适配iOS7时发现，7以下的自定义的AlertView不起作用，查了下文档，原来从iOS7开始，AlertView不能随便写了，所以就找到个替代AlertView的方法

#import <UIKit/UIKit.h>

@interface CustomIOS7AlertView : UIView

@property (nonatomic, retain) UIView *parentView;    

@property (nonatomic, retain) UIView *dialogView;    

@property (nonatomic, retain) UIView *containerView; 

@property (nonatomic, retain) UIView *buttonView;    


@property (nonatomic, assign) id delegate;
@property (nonatomic, retain) NSMutableArray *buttonTitles;

- (id)initWithParentView: (UIView *)_parentView;
- (void)show;
- (void)close;
- (void)setButtonTitles: (NSMutableArray *)buttonTitles;

#import "CustomIOS7AlertView.h"

@implementation CustomIOS7AlertView

@synthesize parentView, containerView, dialogView, buttonView;
@synthesize delegate;
@synthesize buttonTitles;

CGFloat static defaultButtonHeight = 50;
CGFloat static defaultButtonSpacerHeight = 1;
CGFloat static cornerRadius = 7;

CGFloat buttonHeight = 0;
CGFloat buttonSpacerHeight = 0;

- (id)initWithParentView: (UIView *)_parentView
{
    self = [super initWithFrame:_parentView.frame];
    if (self) {
        parentView = _parentView;
        delegate = self;
        buttonTitles = [NSMutableArray arrayWithObject:@"Close"];
    }
    return self;
}

// Create the dialog view, and animate opening the dialog
- (void)show
{
    dialogView = [self createContainerView];

    dialogView.layer.opacity = 0.5f;
    dialogView.layer.transform = CATransform3DMakeScale(1.3f, 1.3f, 1.0);

    self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0];

    [self addSubview:dialogView];
    [parentView addSubview:self];

    [UIView animateWithDuration:0.2f delay:0.0 options:UIViewAnimationOptionCurveEaseInOut
                     animations:^{
                         self.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.4f];
                         dialogView.layer.opacity = 1.0f;
                         dialogView.layer.transform = CATransform3DMakeScale(1, 1, 1);
                     }
                     completion:NULL
     ];
}

- (void)setDelegate: (id)_delegate
{
    delegate = _delegate;
}

// Button has touched
- (IBAction)customIOS7dialogButtonTouchUpInside:(id)sender
{
    [delegate customIOS7dialogButtonTouchUpInside:self clickedButtonAtIndex:[sender tag]];
    [self close];
}

// Default button behaviour
- (void)customIOS7dialogButtonTouchUpInside: (CustomIOS7AlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSLog(@"Button Clicked! %d, %d", buttonIndex, [alertView tag]);
    [self close];
}

// Dialog close animation then cleaning and removing the view from the parent
- (void)close
{
    dialogView.layer.transform = CATransform3DMakeScale(1, 1, 1);
    dialogView.layer.opacity = 1.0f;

    [UIView animateWithDuration:0.2f delay:0.0 options:UIViewAnimationOptionTransitionNone
                     animations:^{
                         self.backgroundColor = [UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.0f];
                         dialogView.layer.transform = CATransform3DMakeScale(0.6f, 0.6f, 1.0);
                         dialogView.layer.opacity = 0.0f;
                     }
                     completion:^(BOOL finished) {
                         for (UIView *v in [self subviews]) {
                             [v removeFromSuperview];
                         }
                         [self removeFromSuperview];
                     }
     ];
}

- (void)setSubView: (UIView *)subView
{
    containerView = subView;
}

// Creates the container view here: create the dialog, then add the custom content and buttons
- (UIView *)createContainerView
{
    if ([buttonTitles count] > 0) {
        buttonHeight = defaultButtonHeight;
        buttonSpacerHeight = defaultButtonSpacerHeight;
    } else {
        buttonHeight = 0;
        buttonSpacerHeight = 0;
    }

    if (containerView == NULL) {
        containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 150)];
    }

    CGFloat dialogWidth = containerView.frame.size.width;
    CGFloat dialogHeight = containerView.frame.size.height + buttonHeight + buttonSpacerHeight;

    CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
    CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height;

    UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation];
    if (UIDeviceOrientationIsLandscape(deviceOrientation)) {
        CGFloat tmp = screenWidth;
        screenWidth = screenHeight;
        screenHeight = tmp;
    }

    // For the black background
    [self setFrame:CGRectMake(0, 0, screenWidth, screenHeight)];

    // This is the dialog's container; we attach the custom content and the buttons to this one
    UIView *dialogContainer = [[UIView alloc] initWithFrame:CGRectMake((screenWidth - dialogWidth) / 2, (screenHeight - dialogHeight) / 2, dialogWidth, dialogHeight)];


    // First, we style the dialog to match the iOS7 UIAlertView >>>
    CAGradientLayer *gradient = [CAGradientLayer layer];
    gradient.frame = dialogContainer.bounds;
    gradient.colors = [NSArray arrayWithObjects:
                       (id)[[UIColor colorWithRed:218.0/255.0 green:218.0/255.0 blue:218.0/255.0 alpha:1.0f] CGColor],
                       (id)[[UIColor colorWithRed:233.0/255.0 green:233.0/255.0 blue:233.0/255.0 alpha:1.0f] CGColor],
                       (id)[[UIColor colorWithRed:218.0/255.0 green:218.0/255.0 blue:218.0/255.0 alpha:1.0f] CGColor],
                       nil];
    gradient.cornerRadius = cornerRadius;
    [dialogContainer.layer insertSublayer:gradient atIndex:0];

    dialogContainer.layer.cornerRadius = cornerRadius;
    dialogContainer.layer.borderColor = [[UIColor colorWithRed:198.0/255.0 green:198.0/255.0 blue:198.0/255.0 alpha:1.0f] CGColor];
    dialogContainer.layer.borderWidth = 1;
    dialogContainer.layer.shadowRadius = cornerRadius + 5;
    dialogContainer.layer.shadowOpacity = 0.1f;
    dialogContainer.layer.shadowOffset = CGSizeMake(0 - (cornerRadius+5)/2, 0 - (cornerRadius+5)/2);
    // ^^^

    // There is a line above the button
    UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, dialogContainer.bounds.size.height - buttonHeight - buttonSpacerHeight, dialogContainer.bounds.size.width, buttonSpacerHeight)];
    lineView.backgroundColor = [UIColor colorWithRed:198.0/255.0 green:198.0/255.0 blue:198.0/255.0 alpha:1.0f];
    [dialogContainer addSubview:lineView];
    // ^^^

    // Add the custom container if there is any
    [dialogContainer addSubview:containerView];

    // Add the buttons too
    [self addButtonsToView:dialogContainer];

    return dialogContainer;
}

- (void)addButtonsToView: (UIView *)container
{
    CGFloat buttonWidth = container.bounds.size.width / [buttonTitles count];

    for (int i=0; i<[buttonTitles count]; i++) {

        UIButton *closeButton = [UIButton buttonWithType:UIButtonTypeCustom];

        [closeButton setFrame:CGRectMake(i * buttonWidth, container.bounds.size.height - buttonHeight, buttonWidth, buttonHeight)];

        [closeButton addTarget:self action:@selector(customIOS7dialogButtonTouchUpInside:) forControlEvents:UIControlEventTouchUpInside];
        [closeButton setTag:i];

        [closeButton setTitle:[buttonTitles objectAtIndex:i] forState:UIControlStateNormal];
        [closeButton setTitleColor:[UIColor colorWithRed:0.0f green:0.5f blue:1.0f alpha:1.0f] forState:UIControlStateNormal];
        [closeButton setTitleColor:[UIColor colorWithRed:0.2f green:0.2f blue:0.2f alpha:0.5f] forState:UIControlStateHighlighted];
        [closeButton.titleLabel setFont:[UIFont boldSystemFontOfSize:14.0f]];
        [closeButton.layer setCornerRadius:cornerRadius];

        [container addSubview:closeButton];
    }

}

@end

用法：

CustomIOS7AlertView *alertView = [[CustomIOS7AlertView alloc] initWithParentView:self.view];

    // Add some custom content to the alert view
    [alertView setContainerView:[self createDemoView]];

    [alertView setButtonTitles:[NSMutableArray arrayWithObjects:@"Close1", @"Close2", @"Close3", nil]];
    [alertView setDelegate:self];

    // And launch the dialog
    [alertView show];

- (UIView *)createDemoView
{
    UIView *demoView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 290, 200)];

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 270, 180)];
    [imageView setImage:[UIImage imageNamed:@"demo"]];
    [demoView addSubview:imageView];

    return demoView;
}

其他：完整的Demo下载