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本文参考Demo:http://code4app.com/ios/JKAlertDialog/55019c35933bf078768b4748
如果在导航中使用自定义警告框，如果警告框添加在view上的话则导航栏不会被挡住，只有添加在window上才能挡住导航栏
这里主要对如何自定义警告框进行一个介绍
首先在CustomAlertView.h中写
#import <UIKit/UIKit.h>
@interface CustomAlertView : UIView
- (id)initWithFrame:(CGRect)frame withTitleStr:(NSString *)titleStr withContentStr:(NSString *)contentStr withButtonStr:(NSString *)buttonStr;
- (void)show;//警告框展示的方法
@end
在CustomAlertView.m中写
@implementation CustomAlertView
- (id)initWithFrame:(CGRect)frame withTitleStr:(NSString *)titleStr withContentStr:(NSString *)contentStr withButtonStr:(NSString *)buttonStr
{
self = [super initWithFrame:frame];
if (self) {
_titleStr = titleStr;
_contentStr = contentStr;
_buttonStr = buttonStr;
[self creatView];
}
return self;
}
- (void)creatView
{
_subBackView = [[UIView alloc] initWithFrame:self.frame];
_subBackView.backgroundColor = [UIColor blackColor];
_subBackView.alpha = 0;
[self addSubview:_subBackView];
UIView *backView = [[UIView alloc] init];
backView.center = CGPointMake(self.frame.size.width / 2.0f, self.frame.size.height / 2.0 - 50);
backView.bounds = CGRectMake(0, 0, 250, 185);
backView.backgroundColor = [UIColor whiteColor];
backView.layer.cornerRadius = 5;
backView.layer.masksToBounds = YES;
[self addSubview:backView];
_backView = backView;
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 100, 15)];
titleLabel.text = _titleStr;
titleLabel.font = [UIFont systemFontOfSize:13.0f];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.textColor = [UIColor grayColor];
[backView addSubview:titleLabel];
UITextView *contentTextView = [[UITextView alloc] initWithFrame:CGRectMake(5, 25, CGRectGetWidth(backView.frame) - 10, 110)];
contentTextView.text = _contentStr;
contentTextView.font = [UIFont systemFontOfSize:12.0f];
contentTextView.backgroundColor = [UIColor clearColor];
contentTextView.delegate = self;
contentTextView.textColor = [UIColor grayColor];
[backView addSubview:contentTextView];
UIButton *certainButton = [UIButton buttonWithType:UIButtonTypeCustom];
certainButton.frame = CGRectMake(20, 140, 210, 40);
certainButton.backgroundColor = [UIColor purpleColor];
certainButton.layer.cornerRadius = 5;
certainButton.layer.masksToBounds = YES;
certainButton.titleLabel.font = [UIFont systemFontOfSize:15.0f];
certainButton.titleLabel.font = [UIFont boldSystemFontOfSize:17.0f];
[certainButton setTitle:_buttonStr forState:UIControlStateNormal];
[certainButton addTarget:self action:@selector(certainButtonClick) forControlEvents:UIControlEventTouchUpInside];
[backView addSubview:certainButton];
}
#pragma mark - certainButtonClick
- (void)certainButtonClick
{
[UIView animateWithDuration:0.4 animations:^{
_backView.alpha = 0.0;
_subBackView.alpha = 0.0;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}
#pragma mark - show
-(UIView*)topView{
UIWindow *window = [[UIApplication sharedApplication] keyWindow];
return window.subviews[0];
}
- (void)show
{
[UIView animateWithDuration:0.5 animations:^{
_backView.alpha = 1;
_subBackView.alpha = 0.5;
} completion:^(BOOL finished) {
}];
[[self topView] addSubview:self];
[self showAnimation];
}
#pragma mark - UITextViewDelegate
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
return NO;
}
#pragma mark - Animation
- (void)showAnimation {
CAKeyframeAnimation *alertViewshowAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
alertViewshowAnimation .duration = 0.4;
alertViewshowAnimation .values = @[[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.01f, 0.01f, 1.0f)],
[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.1f, 1.1f, 1.0f)],
[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9f, 0.9f, 1.0f)],
[NSValue valueWithCATransform3D:CATransform3DIdentity]];
alertViewshowAnimation.keyTimes = @[@0.2f, @0.5f, @0.75f, @1.0f];
alertViewshowAnimation.timingFunctions = @[[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[_backView.layer addAnimation:showAnimation forKey:nil];
}
@end
使用方法
CustomAlertView *rulesView = [[CustomAlertView alloc] initWithFrame:[UIScreen mainScreen].bounds withTitleStr:@"获取规则" withContentStr:@"1.根据投资次数：投资一次获得1分,每天获取1次；\n2.根据投资次数：投资一次获得1分,每天获取1次；\n3.根据投资次数：投资一次获得1分,每天获取1次；" withButtonStr:@"我知道了"];
[rulesView show];
效果图
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