iOS开发-自定义UIAlterView(iOS 7)

App中不可能少了弹框，弹框是交互的必要形式，使用起来也非常简单，不过最近需要自定义一个弹框，虽然iOS本身的弹框已经能满足大部分的需求，但是不可避免还是需要做一些自定义的工作。iOS7之前是可以自定义AlterView的，就是继承一下UIAlterView，然后初始化的时候通过addSubview添加自定义的View，但是iOS7之后这样做就不行了，不过还好有开源项目可以解决这个问题。

iOS默认弹框

viewDidLoad中添加两个按钮，代码如下:

    UIButton  *orignalBtn=[[UIButton alloc]initWithFrame:CGRectMake(100, 40, 100, 50)];
    [orignalBtn setBackgroundColor:[UIColor greenColor]];
    [orignalBtn setTitle:@"iOS弹框" forState:UIControlStateNormal];
    [orignalBtn addTarget:self action:@selector(orignalShow) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:orignalBtn];

    UIButton  *customlBtn=[[UIButton alloc]initWithFrame:CGRectMake(100, 140, 100, 50)];
    [customlBtn setBackgroundColor:[UIColor redColor]];
    [customlBtn setTitle:@"自定义弹框" forState:UIControlStateNormal];
    [customlBtn addTarget:self action:@selector(customShow) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:customlBtn];

　响应默认弹框事件:

-(void)orignalShow{
    UIAlertView *alterView=[[UIAlertView alloc]initWithTitle:@"提示" message:@"博客园-Fly_Elephant" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
    [alterView show];
}

　　效果如下:

自定义弹框

主要解决iOS7之后的系统无法自定义弹框的问题，使用开源项目，项目地址:https://github.com/wimagguc/ios-custom-alertview,其实就是自定义了一个类:

CustomIOSAlertView.h

#import <UIKit/UIKit.h>

@protocol CustomIOSAlertViewDelegate

- (void)customIOS7dialogButtonTouchUpInside:(id)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;

@end

@interface CustomIOSAlertView : UIView<CustomIOSAlertViewDelegate>

@property (nonatomic, retain) UIView *parentView;    // The parent view this 'dialog' is attached to
@property (nonatomic, retain) UIView *dialogView;    // Dialog's container view
@property (nonatomic, retain) UIView *containerView; // Container within the dialog (place your ui elements here)

@property (nonatomic, assign) id<CustomIOSAlertViewDelegate> delegate;
@property (nonatomic, retain) NSArray *buttonTitles;
@property (nonatomic, assign) BOOL useMotionEffects;

@property (copy) void (^onButtonTouchUpInside)(CustomIOSAlertView *alertView, int buttonIndex) ;

- (id)init;

/*!
 DEPRECATED: Use the [CustomIOSAlertView init] method without passing a parent view.
 */
- (id)initWithParentView: (UIView *)_parentView __attribute__ ((deprecated));

- (void)show;
- (void)close;

- (IBAction)customIOS7dialogButtonTouchUpInside:(id)sender;
- (void)setOnButtonTouchUpInside:(void (^)(CustomIOSAlertView *alertView, int buttonIndex))onButtonTouchUpInside;

- (void)deviceOrientationDidChange: (NSNotification *)notification;
- (void)dealloc;

@end

CustomIOSAlertView.m

#import "CustomIOSAlertView.h"
#import <QuartzCore/QuartzCore.h>

const static CGFloat kCustomIOSAlertViewDefaultButtonHeight       = 50;
const static CGFloat kCustomIOSAlertViewDefaultButtonSpacerHeight = 1;
const static CGFloat kCustomIOSAlertViewCornerRadius              = 7;
const static CGFloat kCustomIOS7MotionEffectExtent                = 10.0;

@implementation CustomIOSAlertView

CGFloat buttonHeight = 0;
CGFloat buttonSpacerHeight = 0;

@synthesize parentView, containerView, dialogView, onButtonTouchUpInside;
@synthesize delegate;
@synthesize buttonTitles;
@synthesize useMotionEffects;

- (id)initWithParentView: (UIView *)_parentView
{
    self = [self init];
    if (_parentView) {
        self.frame = _parentView.frame;
        self.parentView = _parentView;
    }
    return self;
}

- (id)init
{
    self = [super init];
    if (self) {
        self.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height);

        delegate = self;
        useMotionEffects = false;
        buttonTitles = @[@"Close"];

        [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    }
    return self;
}

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

    dialogView.layer.shouldRasterize = YES;
    dialogView.layer.rasterizationScale = [[UIScreen mainScreen] scale];

    self.layer.shouldRasterize = YES;
    self.layer.rasterizationScale = [[UIScreen mainScreen] scale];

#if (defined(__IPHONE_7_0))
    if (useMotionEffects) {
        [self applyMotionEffects];
    }
#endif

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

    [self addSubview:dialogView];

    // Can be attached to a view or to the top most window
    // Attached to a view:
    if (parentView != NULL) {
        [parentView addSubview:self];

    // Attached to the top most window
    } else {

        // On iOS7, calculate with orientation
        if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1) {

            UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
            switch (interfaceOrientation) {
                case UIInterfaceOrientationLandscapeLeft:
                    self.transform = CGAffineTransformMakeRotation(M_PI * 270.0 / 180.0);
                    break;

                case UIInterfaceOrientationLandscapeRight:
                    self.transform = CGAffineTransformMakeRotation(M_PI * 90.0 / 180.0);
                    break;

                case UIInterfaceOrientationPortraitUpsideDown:
                    self.transform = CGAffineTransformMakeRotation(M_PI * 180.0 / 180.0);
                    break;

                default:
                    break;
            }

            [self setFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];

        // On iOS8, just place the dialog in the middle
        } else {

            CGSize screenSize = [self countScreenSize];
            CGSize dialogSize = [self countDialogSize];
            CGSize keyboardSize = CGSizeMake(0, 0);

            dialogView.frame = CGRectMake((screenSize.width - dialogSize.width) / 2, (screenSize.height - keyboardSize.height - dialogSize.height) / 2, dialogSize.width, dialogSize.height);

        }

        [[[[UIApplication sharedApplication] windows] firstObject] addSubview:self];
    }

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

    [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
     ];

}

// Button has been touched
- (IBAction)customIOS7dialogButtonTouchUpInside:(id)sender
{
    if (delegate != NULL) {
        [delegate customIOS7dialogButtonTouchUpInside:self clickedButtonAtIndex:[sender tag]];
    }

    if (onButtonTouchUpInside != NULL) {
        onButtonTouchUpInside(self, (int)[sender tag]);
    }
}

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

// Dialog close animation then cleaning and removing the view from the parent
- (void)close
{
    CATransform3D currentTransform = dialogView.layer.transform;

    if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1) {
        CGFloat startRotation = [[dialogView valueForKeyPath:@"layer.transform.rotation.z"] floatValue];
        CATransform3D rotation = CATransform3DMakeRotation(-startRotation + M_PI * 270.0 / 180.0, 0.0f, 0.0f, 0.0f);

        dialogView.layer.transform = CATransform3DConcat(rotation, 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 = CATransform3DConcat(currentTransform, 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 (containerView == NULL) {
        containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 150)];
    }

    CGSize screenSize = [self countScreenSize];
    CGSize dialogSize = [self countDialogSize];

    // For the black background
    [self setFrame:CGRectMake(0, 0, screenSize.width, screenSize.height)];

    // This is the dialog's container; we attach the custom content and the buttons to this one
    UIView *dialogContainer = [[UIView alloc] initWithFrame:CGRectMake((screenSize.width - dialogSize.width) / 2, (screenSize.height - dialogSize.height) / 2, dialogSize.width, dialogSize.height)];

    // 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];

    CGFloat cornerRadius = kCustomIOSAlertViewCornerRadius;
    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);
    dialogContainer.layer.shadowColor = [UIColor blackColor].CGColor;
    dialogContainer.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:dialogContainer.bounds cornerRadius:dialogContainer.layer.cornerRadius].CGPath;

    // 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;
}

// Helper function: add buttons to container
- (void)addButtonsToView: (UIView *)container
{
    if (buttonTitles==NULL) { return; }

    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:kCustomIOSAlertViewCornerRadius];

        [container addSubview:closeButton];
    }
}

// Helper function: count and return the dialog's size
- (CGSize)countDialogSize
{
    CGFloat dialogWidth = containerView.frame.size.width;
    CGFloat dialogHeight = containerView.frame.size.height + buttonHeight + buttonSpacerHeight;

    return CGSizeMake(dialogWidth, dialogHeight);
}

// Helper function: count and return the screen's size
- (CGSize)countScreenSize
{
    if (buttonTitles!=NULL && [buttonTitles count] > 0) {
        buttonHeight       = kCustomIOSAlertViewDefaultButtonHeight;
        buttonSpacerHeight = kCustomIOSAlertViewDefaultButtonSpacerHeight;
    } else {
        buttonHeight = 0;
        buttonSpacerHeight = 0;
    }

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

    // On iOS7, screen width and height doesn't automatically follow orientation
    if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1) {
        UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
        if (UIInterfaceOrientationIsLandscape(interfaceOrientation)) {
            CGFloat tmp = screenWidth;
            screenWidth = screenHeight;
            screenHeight = tmp;
        }
    }

    return CGSizeMake(screenWidth, screenHeight);
}

#if (defined(__IPHONE_7_0))
// Add motion effects
- (void)applyMotionEffects {

    if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {
        return;
    }

    UIInterpolatingMotionEffect *horizontalEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x"
                                                                                                    type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
    horizontalEffect.minimumRelativeValue = @(-kCustomIOS7MotionEffectExtent);
    horizontalEffect.maximumRelativeValue = @( kCustomIOS7MotionEffectExtent);

    UIInterpolatingMotionEffect *verticalEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y"
                                                                                                  type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    verticalEffect.minimumRelativeValue = @(-kCustomIOS7MotionEffectExtent);
    verticalEffect.maximumRelativeValue = @( kCustomIOS7MotionEffectExtent);

    UIMotionEffectGroup *motionEffectGroup = [[UIMotionEffectGroup alloc] init];
    motionEffectGroup.motionEffects = @[horizontalEffect, verticalEffect];

    [dialogView addMotionEffect:motionEffectGroup];
}
#endif

- (void)dealloc
{
    [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
}

// Rotation changed, on iOS7
- (void)changeOrientationForIOS7 {

    UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];

    CGFloat startRotation = [[self valueForKeyPath:@"layer.transform.rotation.z"] floatValue];
    CGAffineTransform rotation;

    switch (interfaceOrientation) {
        case UIInterfaceOrientationLandscapeLeft:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 270.0 / 180.0);
            break;

        case UIInterfaceOrientationLandscapeRight:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 90.0 / 180.0);
            break;

        case UIInterfaceOrientationPortraitUpsideDown:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 180.0 / 180.0);
            break;

        default:
            rotation = CGAffineTransformMakeRotation(-startRotation + 0.0);
            break;
    }

    [UIView animateWithDuration:0.2f delay:0.0 options:UIViewAnimationOptionTransitionNone
                     animations:^{
                         dialogView.transform = rotation;

                     }
                     completion:nil
     ];

}

// Rotation changed, on iOS8
- (void)changeOrientationForIOS8: (NSNotification *)notification {

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

    [UIView animateWithDuration:0.2f delay:0.0 options:UIViewAnimationOptionTransitionNone
                     animations:^{
                         CGSize dialogSize = [self countDialogSize];
                         CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
                         self.frame = CGRectMake(0, 0, screenWidth, screenHeight);
                         dialogView.frame = CGRectMake((screenWidth - dialogSize.width) / 2, (screenHeight - keyboardSize.height - dialogSize.height) / 2, dialogSize.width, dialogSize.height);
                     }
                     completion:nil
     ];

}

// Handle device orientation changes
- (void)deviceOrientationDidChange: (NSNotification *)notification
{
    // If dialog is attached to the parent view, it probably wants to handle the orientation change itself
    if (parentView != NULL) {
        return;
    }

    if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1) {
        [self changeOrientationForIOS7];
    } else {
        [self changeOrientationForIOS8:notification];
    }
}

// Handle keyboard show/hide changes
- (void)keyboardWillShow: (NSNotification *)notification
{
    CGSize screenSize = [self countScreenSize];
    CGSize dialogSize = [self countDialogSize];
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    if (UIInterfaceOrientationIsLandscape(interfaceOrientation)) {
        CGFloat tmp = keyboardSize.height;
        keyboardSize.height = keyboardSize.width;
        keyboardSize.width = tmp;
    }

    [UIView animateWithDuration:0.2f delay:0.0 options:UIViewAnimationOptionTransitionNone
					 animations:^{
                         dialogView.frame = CGRectMake((screenSize.width - dialogSize.width) / 2, (screenSize.height - keyboardSize.height - dialogSize.height) / 2, dialogSize.width, dialogSize.height);
					 }
					 completion:nil
	 ];
}

- (void)keyboardWillHide: (NSNotification *)notification
{
    CGSize screenSize = [self countScreenSize];
    CGSize dialogSize = [self countDialogSize];

    [UIView animateWithDuration:0.2f delay:0.0 options:UIViewAnimationOptionTransitionNone
					 animations:^{
                         dialogView.frame = CGRectMake((screenSize.width - dialogSize.width) / 2, (screenSize.height - dialogSize.height) / 2, dialogSize.width, dialogSize.height);
					 }
					 completion:nil
	 ];
}

@end

调用代码:

-(void)customShow{
    CustomIOSAlertView *alertView = [[CustomIOSAlertView alloc] init];

    [alertView setContainerView:[self customView]];

    [alertView setButtonTitles:[NSMutableArray arrayWithObjects:@"取消", @"确定", nil]];
    [alertView setDelegate:self];

    [alertView setOnButtonTouchUpInside:^(CustomIOSAlertView *alertView, int buttonIndex) {
        NSString *result=alertView.buttonTitles[buttonIndex];
        NSLog(@"点击了%@按钮",result);
        [alertView close];
    }];

    [alertView setUseMotionEffects:true];
    [alertView show];

}

- (UIView *)customView
{
    UIView *customView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 240, 160)];

    UILabel *tip=[[UILabel alloc]initWithFrame:CGRectMake(100, 10, 50, 30)];
    [tip setText:@"提示"];
    [customView addSubview:tip];

    UILabel *content=[[UILabel alloc]initWithFrame:CGRectMake(10, 60, 210, 30)];
    [content setText:@"http://www.cnblogs.com/xiaofeixiang"];
    [content setFont:[UIFont systemFontOfSize:12]];
    [customView addSubview:content];
    return customView;
}

　效果如下: