UIActionSheet,UIPickerView,修改navi的back按钮颜色

显示UIActionSheet

-(void)showAlert:(NSString *)msg {
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Action Sheet选择项"
message:msg
delegate:self
cancelButtonTitle:@"确定"
otherButtonTitles: nil];
[alert show];
}

UIActionSheet的delegate

(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0) {
[self showAlert:@"确定"];
}else if (buttonIndex == 1) {
[self showAlert:@"第一项"];
}else if(buttonIndex == 2) {
[self showAlert:@"第二项"];
}else if(buttonIndex == 3) {
[self showAlert:@"取消"];
}

}
- (void)actionSheetCancel:(UIActionSheet *)actionSheet{

}
-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{

}
-(void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex{

}

UIPickerView主要的delegate和datasource

// returns the number of 'columns' to display.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;

// returns the # of rows in each component..
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;

设置nanvigationitem上backbutton或者rightbutton的颜色 （是可以改的 ）

UIBarButtonItem *barbutton =[[UIBarButtonItem alloc] init];
barbutton.title = @"";
self.navigationController.navigationBar.barStyle = UIStatusBarStyleDefault;
[self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];
self.navigationItem.backBarButtonItem = barbutton;
barbutton = nil;

今天还用了一个为button加下划线的

UILabel *testLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 320, 30)];

testLabel.backgroundColor = [UIColor lightGrayColor];

testLabel.textAlignment = NSTextAlignmentCenter;

NSMutableAttributedString *AttributedStr = [[NSMutableAttributedString alloc]initWithString:@"今天天气不错呀"];

[AttributedStr addAttribute:NSFontAttributeName

value:[UIFont systemFontOfSize:16.0]

range:NSMakeRange(2, 2)];

[AttributedStr addAttribute:NSForegroundColorAttributeName

value:[UIColor redColor]

range:NSMakeRange(2, 2)];

testLabel.attributedText = AttributedStr;

[self.view addSubview:testLabel];

使用方法：

为某一范围内文字设置多个属性

- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range;

为某一范围内文字添加某个属性

- (void)addAttribute:(NSString *)name value:(id)value
range:(NSRange)range;

为某一范围内文字添加多个属性

- (void)addAttributes:(NSDictionary *)attrs range:(NSRange)range;

移除某范围内的某个属性

- (void)removeAttribute:(NSString *)name range:(NSRange)range;

2. 常见的属性及说明

NSFontAttributeName 字体

NSParagraphStyleAttributeName 段落格式

NSForegroundColorAttributeName 字体颜色

NSBackgroundColorAttributeName 背景颜色

NSStrikethroughStyleAttributeName删除线格式

NSUnderlineStyleAttributeName 下划线格式

NSStrokeColorAttributeName 删除线颜色

NSStrokeWidthAttributeName删除线宽度

NSShadowAttributeName 阴影