如果需要在状态栏显示自定义的消息时，就需要自定义状态栏。
代码如下：
XYCustomStatusBar.h
#import <UIKit/UIKit.h>
@interface XYCustomStatusBar : UIWindow{
UILabel *_messageLabel;
}
- (void)showStatusMessage:(NSString *)message;
- (void)hide;
@end
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XYCustomStatusBar.m
#import "XYCustomStatusBar.h"
@implementation XYCustomStatusBar
- (void)dealloc{
[super dealloc];
[_messageLabel release], _messageLabel = nil;
}
- (id)init{
self = [super init];
if (self) {
self.frame = [UIApplication sharedApplication].statusBarFrame;
self.backgroundColor = [UIColor blackColor];
self.windowLevel = UIWindowLevelStatusBar + 1.0f;
_messageLabel = [[UILabel alloc] initWithFrame:self.bounds];
[_messageLabel setTextColor:[UIColor whiteColor]];
[_messageLabel setTextAlignment:NSTextAlignmentRight];
[_messageLabel setBackgroundColor:[UIColor clearColor]];
[self addSubview:_messageLabel];
}
return self;
}
- (void)showStatusMessage:(NSString *)message{
self.hidden = NO;
self.alpha = 1.0f;
_messageLabel.text = @"";
CGSize totalSize = self.frame.size;
self.frame = (CGRect){ self.frame.origin, 0, totalSize.height };
[UIView animateWithDuration:0.5 animations:^{
self.frame = (CGRect){self.frame.origin, totalSize };
} completion:^(BOOL finished){
_messageLabel.text = message;
}];
}
- (void)hide{
self.alpha = 1.0f;
[UIView animateWithDuration:0.5f animations:^{
self.alpha = 0.0f;
} completion:^(BOOL finished){
_messageLabel.text = @"";
self.hidden = YES;
}];
}
@end
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为了让自定义的状态栏可以让用户看到，设置了它的windowlevel，在ios中，windowlevel属性决定了UIWindow的显示层次，默认的windowlevel为UIWindowLevelNormal，即0.0 。为了能覆盖默认的状态栏，将windowlevel设置高点。其他代码基本上都不解释什么，如果要特殊效果，可以自己添加。
