自定义AlertView的方法和改变Alert的弹出位置以及其宽度

此方法在IOS7中不适合

一、自定义AlertView

　　1、首先新建一个OC类继承与AlertView。

　　2、然后再.m中添加方法 - (void)layoutSubviews

　　　　可以再这个方法里边改变alertView的背景图片，各个按钮的图片，等一系列的操作

　　　　示例代码如下：

　　　　

for (UIView *v inself.subviews) {

if ([v isKindOfClass:[UIImageView class]]) {

UIImageView *imageV = (UIImageView *)v;

UIImage *image = [UIImage imageNamed:kAlertViewBackground];

image = [[image stretchableImageWithLeftCapWidth:0topCapHeight:kAlertViewBackgroundCapHeight] retain];

[imageV setImage:image];//替换alertView地背景图片

}

if ([v isKindOfClass:[UILabel class]]) {

UILabel *label = (UILabel *)v;

if ([label.text isEqualToString:self.title]) {

label.font = [kAlertViewTitleFont retain];

label.numberOfLines = 0;

label.lineBreakMode = UILineBreakModeWordWrap;

label.textColor = kAlertViewTitleTextColor;

label.backgroundColor = [UIColor clearColor];

label.textAlignment = UITextAlignmentCenter;

label.shadowColor = kAlertViewTitleShadowColor;

label.shadowOffset = kAlertViewTitleShadowOffset;//替换Title的样式

}else{

label.font = [kAlertViewMessageFont retain];

label.numberOfLines = 0;

label.lineBreakMode = UILineBreakModeWordWrap;

label.textColor = kAlertViewMessageTextColor;

label.backgroundColor = [UIColor clearColor];

label.textAlignment = UITextAlignmentCenter;

label.shadowColor = kAlertViewMessageShadowColor;

label.shadowOffset = kAlertViewMessageShadowOffset;

}

}

if ([v isKindOfClass:NSClassFromString(@"UIAlertButton")]) {//替换取消等按钮的样式

UIButton *button = (UIButton *)v;

UIImage *image = nil;

if (button.tag == 1) {

image = [UIImage imageNamed:[NSString stringWithFormat:@"alert-%@-button.png", @"gray"]];

}else{

image = [UIImage imageNamed:[NSString stringWithFormat:@"alert-%@-button.png", @"black"]];

}

image = [image stretchableImageWithLeftCapWidth:(int)(image.size.width+1)>>1 topCapHeight:0];

button.titleLabel.font = kAlertViewButtonFont;

button.titleLabel.minimumFontSize = 10;

button.titleLabel.textAlignment = UITextAlignmentCenter;

button.titleLabel.shadowOffset = kAlertViewButtonShadowOffset;

button.backgroundColor = [UIColor clearColor];

[button setBackgroundImage:image forState:UIControlStateNormal];

[button setTitleColor:kAlertViewButtonTextColorforState:UIControlStateNormal];

[button setTitleShadowColor:kAlertViewButtonShadowColorforState:UIControlStateNormal];

}

}

二、更改AlertView的弹出位置及其宽度

　　在代理方法

- (void)willPresentAlertView:(UIAlertView *)alertView

中修改。