iphone開發(fā)中的一些小技巧
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1.只有這2種數字鍵盤才有效果。UIKeyboardTypeNumberPad，UIKeyboardTypePhonePad
2. keyboardAppearance = UIKeyboardAppearanceAlert
- (void)textViewDidBeginEditing:(UITextView *)textView{
NSArray *ws = [[UIApplication sharedApplication] windows];
for(UIView *w in ws){
NSArray *vs = [w subviews];
for(UIView *v in vs)
{
if([[NSString stringWithUTF8String:object_getClassName(v)] isEqualToString:@UIKeyboard])
{
v.backgroundColor = [UIColor redColor];
}
}
}
13、設置時區(qū)
NSTimeZone *defaultTimeZone = [NSTimeZone defaultTimeZone];
NSTimeZone *tzGMT = [NSTimeZone timeZoneWithName:@GMT];
[NSTimeZone setDefaultTimeZone:tzGMT];
上面兩個時區(qū)任意用一個。
14、Ipad隱藏鍵盤的同時觸發(fā)方法。
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
- (IBAction)keyboardWillHide:(NSNotification *)note
14、在一個程序中打開另一個程序的方法。
http://www.cocoachina.com/iphonedev/sdk/2010/0322/768.html
15、計算字符串的字數
-(int)calculateTextNumber:(NSString *)text
{
float number = 0.0;
int index = 0;
for (index; index [text length]; index++)
{
NSString *protoText = [text substringToIndex:[text length] - index];
NSString *toChangetext = [text substringToIndex:[text length] -1 -index];
NSString *charater;
if ([toChangetext length]==0)
{
charater = protoText;
}
else
{
NSRange range = [text rangeOfString:toChangetext];
charater = [protoText stringByReplacingCharactersInRange:range withString:@];
}
NSLog(charater);
if ([charater lengthOfBytesUsingEncoding:NSUTF8StringEncoding] == 3)
{
number++;
}
else
{
number = number+0.5;
}
}
return ceil(number);
}
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